Old Woman Dozing by Nicolaes Maes (1656). Royal Museums of Fine Arts, Brussels

Old age consists of ages nearing or surpassing the average life span of human beings, and thus the end of the human life cycle. Euphemisms and terms for old people include seniors (American usage), senior citizens (British and American usage) and the elderly.

Old people have limited regenerative abilities and are more prone to disease, syndromes, and sickness than younger adults. For the biology of ageing, see senescence. The medical study of the aging process is gerontology, and the study of diseases that afflict the elderly is geriatrics.

Definition[link]

Elders from Turkey, 2010

The boundary between middle age and old age cannot be defined exactly because it does not have the same meaning in all societies. People can be considered old because of certain changes in their activities or social roles. Examples: people may be considered old when they become grandparents, or when they begin to do less or different work—retirement. Most developed world countries have accepted the chronological age of 65 years as a definition of 'elderly' or older person.

German chancellor Otto von Bismarck created the world's first comprehensive government social safety net in the 1880s, providing for old age pensions and setting 60 as the age of retirement. The fixed retirement age of 70 was the first attempt at defining the start of old age. In the United States of America, and the United Kingdom, the age of 65 was traditionally considered the beginning of the senior years because, until recently, United States and British people became eligible to retire at this age with full Social Security benefits. In 2003, the age at which a US citizen became eligible for full Social Security benefits began to increase gradually, and will continue to do so until it reaches 67 in 2027. Full retirement age for Social Security benefits for people retiring in 2012 is age 66.^[1] Originally, the purpose of old age pensions was to prevent elderly persons from being reduced to beggary, which is still common in some underdeveloped countries, but growing life expectancies and elder populations has brought into question the model under which pension systems were designed.

Changes Associated with Aging[link]

A grey-haired old woman from the United Kingdom

There is often a general physical decline, and people become less active. Old age can cause, amongst other things:

• Wrinkles and liver spots on the skin due to loss of subcutaneous fat
• Change of hair color to gray or white
• Hair loss
• Reduced circulatory system function and blood flow
• Reduced lung capacity
• Reduced immune system function
• Changes in the vocal cords that produce the typical "old person" voice
• Lessened and weakened hearing. Of individuals 75 and older, 48% of men and 37% of women encounter difficulties in hearing. Of the 26.7 million people over age 50 with a hearing impairment, only one in seven, a meager 14 percent, use a hearing aid
• Diminished, and decline in eyesight. It becomes more difficult to read in low lighting and in smaller print. Speed with which an individual reads may also be impaired.
• Reduced mental/cognitive ability.
• Depressed mood
• Lessening or cessation of sex, sometimes because of physical symptoms such as erectile dysfunction in men, but often simply a decline in libido also known as sex drive.
• Greater susceptibility to bone and joint diseases such as osteoarthritis and osteoperosis
• Memory Loss is common due to the decrease in speed of information being encoded, stored, and received. It may take more time to learn new information.

Alzheimer's Disease, the most common form of dementia, is found in old age. It is a general term for memory loss and other intellectual abilities serious enough to interfere with daily life. Alzheimer's disease accounts for 50 to 80 percent of dementia cases.

• Behavioral changes can include wandering, physical aggression, and verbal outbursts due to diseases such as depression, psychosis, or dementia. Although current Alzheimer's treatments cannot stop Alzheimer's from progressing, they can temporarily slow the worsening of dementia symptoms and improve quality of life for those with Alzheimer's and their caregivers. Today, there is a worldwide effort under way to find better ways to treat the disease, delay its onset, and prevent it from developing.

It must be stressed that each individual is different, and health issues that affect one elderly person may not affect another.

Demographic changes[link]

Population aged at least 65 years in 2005

In the industrialized countries, life expectancy has increased consistently over the last decades.^[2] In the United States the proportion of people aged 65 or older increased from 4% in 1900 to about 12% in 2000.^[3] In 1900, only about 3 million of the nation's citizens were 65 or older (out of 76 million total American citizens). By 2000, the number of senior citizens had increased to about 35 million (of 280 million US citizens). Population experts estimate^{[citation needed]} that more than 50 million Americans—about 17 percent of the population—will be 65 or older in 2020. The number of old people is growing around the world chiefly because of the post–World War II baby boom, and increases in the provision and standards of health care.

The growing number of people living to their 80s and 90s in the developed world has strained public welfare systems and has also resulted in increased incidence of diseases like cancer and dementia that were rarely seen in premodern times. When the United States Social Security program was created, persons older than 65 numbered only around 5% of the population and the average life expectancy of a 65 year old in 1936 was approximately 5 years, while in 2011 it could often range from 10–20 years. Other issues that can arise from an increasing population are growing demands for health care and an increase in demand for different types of services.

Psychosocial aspects[link]

An elderly Somali woman.

According to Erik Erikson’s "Eight Stages of Life" theory, the human personality is developed in a series of eight stages that take place from the time of birth and continue on throughout an individual’s complete life. He characterises old age as a period of "Integrity vs. Despair", during which a person focuses on reflecting back on their life. Those who are unsuccessful during this phase will feel that their life has been wasted and will experience many regrets. The individual will be left with feelings of bitterness and despair. Those who feel proud of their accomplishments will feel a sense of integrity. Successfully completing this phase means looking back with few regrets and a general feeling of satisfaction. These individuals will attain wisdom, even when confronting death.^[4][5][6] Coping is a very important skill needed in the aging process to move forward with life and not be 'stuck' in the past. The way a person adapts and copes, reflects their aging process on a psycho-social level (Griffiths,Y & Thinnes,A).

Newman & Newman proposed a ninth stage of life, Elderhood. Elderhood refers to those individuals who live past the life expectancy of their birth cohorts. There are two different types of people described in this stage of life. The "young old" are those healthy individuals who can function on their own without assistance and can complete their daily tasks independently. The "old old" are those who depend on specific services due to declining health or diseases. This period of life is characterized as a period of "immortality vs. extinction." Immortality is the belief that your life will go on past death, some examples are an afterlife or living on through ones family. Extinction refers to feeling as if life has no purpose, an individual could have lived past all family and friends and feel a great loss.

The Disengagement Theory is a mutual withdrawal between elders and society that takes place in anticipation of death. Older people become free from work and family responsibilities allowing them to enjoy the rest of their lives peacefully. They begin to interact less often and activity levels are decreased. However, not all older adults prefer to be disengaged (Berk, 2007). The process of aging and the ways with which it is dealt are directly related to the society to which the aging person belongs. Therefore, disengagement theory is mostly connected with societies that do not place an emphasis on the value, importance, and respectibility of its elders. Many modern societies for example, value high efficiency and contribution, neither of which the elderly are able to provide as well as their younger counterparts. In many ways, they are seen as burdens to these societies, which triggers mutual disengagement between the elderly and the rest of society. According to the disengagement theory, the elderly who disengage take it upon themselves to do so for the benefit of society.

In response to the Disengagement Theory, The Activity Theory of Old Age is a theory of aging which states that the psychological and social needs of the elderly are no differenct from those of the middle-aged and that it is neither normal nor natural for older people to become isolated and withdrawn. This theory is also often called the Implicit Theory Of Aging".

Life expectancy[link]

In most parts of the world, women live, on average, longer than men; even so, the disparities vary between 9 years or more in countries such as Sweden and the United States to no difference or higher life expectancy for men in countries such as Zimbabwe and Uganda.^[7]

The number of elderly persons worldwide began to surge in the second half of the 20th century. Up to that time (and still true in underdeveloped countries), five or less percent of the population was over 65. Few lived longer than their 70s and people who attained advanced age (i.e. their 80s) were rare enough to be a novelty and were revered as wise sages. Accidents and disease claimed many people before they could attain old age, and because health problems in those over 65 meant a quick death in most cases. If a person lived to an advanced age, it was due to genetic factors and/or a relatively easy lifestyle, since diseases of old age could not be treated before the 20th century.

Assistance and Care[link]

According to the Journal "Demography", there is a rise in the elderly living alone if not with a spouse. Individuals 75 and older have decreased in amount needing help taking care of themselves. Many new assistive devices made especially for the home have contributed greatly to this. Some examples of devices are a shower seat (making it so the person does not get tired in the shower and fall), a bed cane (offering support to those with unsteadiness getting in and out of bed), and an ADL cuff (used with eating utensils for people with paralysis or hand weakness).

However around 25% of individuals 85 and older say that they need help with their activities of daily living. There are many options for long term care to those who require it. There is home based care where a family member, volunteer, or trained professional will aid the person in need and help with daily activities. Another option is community services which can provide the person with transportation, meal plans, or activities in senior centers. A third option is assisted living where 24 hour round the clock supervision is given with aid in eating, bathing, dressing, etc. A final option is a nursing home which provides professional nursing care.

See also[link]

• Aging in dogs
• Aging in place
• Centenarian
• Elderly care
• Geriatric care management
• Gerontology
• List of the verified oldest men
• List of the verified oldest women
• Oldest people
• Pensioner
• Respect for the Aged Day
• Silver Alert
• Supercentenarian

References[link]

External links[link]

Wikiquote has a collection of quotations related to: Age

Look up old age, eld, or elderly in Wiktionary, the free dictionary.

Wikimedia Commons has media related to: Old people

• Laura Carstensen - research at Stanford university's Life-span Development Laboratory, and Stanford Center on Longevity.
• International Federation on Aging—informs and promotes positive change for old people globally
• Age UK—UK charity supporting those in old age in the UK and in developing countries
• HelpAge International—UK-based international charity supporting older people in developing countries. Sister organisation of Age UK (above)
• People 'get happier as they age'

(Social Security)http://www.socialsecurity.gov/pgm/retirement.htm ('How Old Do You Feel? It Depends on Your Age')http://www.nytimes.com/2009/06/30/health/30aging.html?_r=1&ref=health

Plants vs. Zombies is a tower defense action video game developed and originally published by PopCap Games for Microsoft Windows and Mac OS X. The game involves a homeowner using many varieties of plants to repel an army of zombies from "eating their brains". It was first released on May 5, 2009, and made available on Steam on the same day.^[2][9] A version for iOS was released in February 2010, and an HD version for the iPad.^[10] An extended Xbox Live Arcade version introducing new gameplay modes and features was released on September 8, 2010.^[5] PopCap released a Nintendo DS version on January 18, 2011 with content unique to the platform.^[11] The PlayStation 3 version was released in February 2011 also with added new co op and versus modes found in the Xbox 360 version. An Android version of the game, exclusive to the Amazon Android App Store, was released on May 31, 2011.^[12] On February 16, 2012, a version was released for BlackBerry PlayBook.^[6] Furthermore, both the original Windows and Mac version of the game have been re-released with additional content in a Game of the Year version. The game received a positive response from critics, and was nominated for multiple Interactive Achievement Awards, alongside receiving praise for its musical score.

Gameplay[link]

In Plants vs. Zombies, players place different types of plants and fungi, each with their own unique offensive or defensive capabilities, around a house in order to stop a horde of zombies from eating the brains of the residents. The playing field is divided into a number of horizontal lanes, and with rare exceptions, a zombie will only move towards the player's house along one lane (the main exception is if it has taken a bite out of a garlic). Most plants can only attack or defend against zombies in the lane they are planted in. In later levels, players can purchase upgrades so as to adapt their lawn mower to new environments like pools or rooftops.

The player starts with a limited number of seed pack types and seed pack slots that they can use during most levels. The number of slots can be increased through purchases with in-game money. At the start of a level, the player is shown the various types of zombies to expect and given the opportunity to select which seed packs to take into the level. Several plants are nocturnal, such as mushrooms, having a lower sunlight cost, and are ideal for nighttime levels. Certain plants are highly effective against specific types of zombies, such as the Magnet-shroom, which can remove metallic items from a zombie, such as helmets, buckets and ladders.

The zombies also come in a number of types that have different attributes, in particular, speed, damage tolerance, and abilities. Zombies include those wearing makeshift armour, those that are able to jump or fly over plants, and a dancing zombie which has different designs depending on the version (one of them bearing intentional resemblance to Michael Jackson in the "Thriller" music video) that is able to summon other zombies from the ground. At various points the player will be inundated with a huge wave of zombies.

Game modes[link]

The primary game mode is a single-player, multi-player and Adventure mode in which the player can earn money to spend at an in-game store to buy new seed packets and other bonuses.

The game also features extra modes that be unlockable as the player progresses through the main adventure. These include a survival game with hard or normal mode, a puzzle mode, and a selection of mini-games which include zombie-themed versions of other PopCap games like Bejeweled.^[13] The game also features a Zen garden, where players can care for plants they acquire from successes in game play. The in-game store also carries items that help with the Zen Garden. The PlayStation Network and Xbox Live Arcade version of the game includes 5 multiplayer modes, both co-operative and competitive, additional mini-games and a virtual house where players can show off their achievements to friends.^[14][15]

Development[link]

Concept[link]

Plants vs. Zombies director George Fan intended on balancing the game between a "gritty" game and a "sickeningly cute" game. Strong strategic elements were included to appeal to more experienced gamers, while keeping it simple to appeal to casual gamers, without many tutorials. He was inspired to make it a tower defense game after both thinking of a more defense-oriented version of a previous title of his, Insaniquarium, and playing some Warcraft III tower defense mods.^[16] While he was looking at the towers in Warcraft III, he felt that plants would make good towers. He wanted to bring something new to the genre with Plants vs. Zombies, and he found common tower defense game play elements such as mazing and juggling^[17] to be too awkward, causing him to use the five and six lane set-ups that were used in the final version.^[18][19]

Fan included elements from the trading card game Magic: The Gathering while teaching his girlfriend Laura Shigihara how to play it, showing her how to customize their decks. That inspired him to include the seed packets as opposed to using a conveyor belt that produced randomly selected plants, due to the complexity of this system. Another influence on Plants vs. Zombies besides Warcraft III and Insaniquarium was Tapper, crediting the use of five lanes to this game.^[18][19] Various members of PopCap Games contributed to the development of Plants vs. Zombies through an internal forum where they gave feedback.

Plants vs. Zombies was originally much like Insaniquarium in that it involved nurturing the plants by watering them and growing grass, but the developers found it to be tedious. It was originally called Weedlings, but this concept was scrapped after the developers realized that there were too many plant-growing games on the market. One of the critical changes to the game was the lowering of the price of Sunflowers from 100 to 50 suns, as those new to the genre would spend their sun power on pea shooters and inevitably lose.^[18] More inspiration for Plants vs. Zombies' mechanics came from the film Swiss Family Robinson, especially where the family defends themselves against pirates. This was the inspiration for the Potato Mine; Fan stated that it was satisfying to watch a zombie step on the mine, being defeated and covered in mashed potatoes.^[20]

Design[link]

The team wanted to bring back the aliens from Insaniquarium, but in the end were changed to zombies, which players could react to more easily because of how slowly they moved. Fan's favorite zombie was the Pole Vaulting Zombie, due to the hilarity involved when a player encounters it for the first time, using a specific example where a player tries to block it with the Wall-Nut, only to have the zombie jump over it.^[21][18][19]

The developers focused on the Adventure mode for the first year of development, but programmer Tod Semple finished his development tasks ahead of schedule. Afterward, he was looking for something to do, and began work on minigame ideas. The Puzzle mode had similar origins; Vasebreaker and I, Zombie came from single-level minigames, but after playing them to tweak them, he found he was addicted to them. Fan found it impressive how well-designed they were, stating that while they were using the same plants and the same zombies, they were reinventions of the game mechanics. Fan worried that the minigame and puzzle modes may distract from the main game, so to keep players focused on the Adventure mode, he required that they beat it before they could move onto these modes. However, this was changed due to comments from beta testers that they would like to try these modes out sooner. The developers allowed players to play a few of the stages from these modes in the middle of Adventure mode. Fan stated that it's a common perception amongst players that the Adventure mode is 90% of the game, while the rest of the game is merely additional content. He hoped that players would appreciate the post-game content. Another mode is the Survival mode, which included an Endless mode. After players were getting to the hundredth level in only three hours, Fan decided to make it more difficult, adding powerful zombies after the 20th level, like the Pogo Zombie.^[19]

Fan stated that every game he worked on had only him designing the prototype, adding that he used to draw a lot before he made games, where he made pixel art. The final designs of the zombies and the first plants are similar to how they were initially. After searching for an artist, they discovered Rich Werner, who Fan thought clicked with what he intended for the design. He attributed the intrigue of the design to its animation scheme; Tod Semple suggested that they animate it in Flash and export it into the game. Fan worried that this would look like it was cut out from paper, and would resemble South Park too much, but was satisfied in the end, attributing this to Semple and Werner's talents.^[19]

Fan was most proud of the Tall-nut, Torchwood, and Cob Cannon plants. He explained that the Tall-nut has character, citing its "determined gaze" and how it sheds a single tear when hurt. Laura Shigihara could not stand to see this, and protected it with a protective plant called a Pumpkin, which can protect plants inside it. He felt that the Torchwood required players to think of how plants interacted with each other. The Cob Cannon went through many design changes, but Fan was happy with the final design.^[18][19] Another favorite plant of Fan's was the Squash, due to how well it explained its purpose, to squash things.^[21] A plant was proposed that is similar to the defensive item Umbrella Leaf, which would be planted above other plants to protect them from airborne zombies. However, it was difficult to visualize their positions.^[19]

Soundtrack[link]

The soundtrack for Plants vs. Zombies was composed by Laura Shigihara. It borrows elements from the pop music genre, as well as console chiptunes. Before the inception of Plants vs. Zombies, Fan asked Laura if she would like to compose the music for his next title after following her for some years. She accepted, owing to his creativity. Shigihara described the music as "macabre, yet goofy". Using the night stage as an example, she used a combination of "Big Band" and swing beats with "several haunting and serious melodies". The songs "Loonboon" and "Brainiac Maniac" were written towards the end of production. She stated that these were reactionary songs that she wrote to fit the feel of the game after having played through it twice. She tried to make the game have a Danny Elfman feel to it, while mixing in melodic tunes and funky beats. She describes a song early in the game, which uses marching band percussion and swing beats. She described another one which used techno beats with organic sounds.^[22] Shigihara also composed and performed the music video shown during the credits of the game, titled "Zombies on Your Lawn".^[23][24]

Cultural references[link]

Plants vs. Zombies uses many cultural references in its names of stages and others. The gravestones' inscriptions ("Expired", "Ceased to Exist", "Just Resting", etc.) were taken from Monty Python's "Dead Parrot sketch". Two of the mini-games—"Zombiquarium" and "Beghouled"—take their names from two other PopCap games, Insaniquarium and Bejeweled respectively.^[19][25] Two levels in "vasebreaker" puzzles "Scary Potter" and "Ace of Vase" take their names from Harry Potter and Ace of Base and in "I, Zombie" (a reference to Isaac Asimov's "I, Robot") puzzles there is a level called "Dead Zeppelin" which resembles Led Zeppelin. Originally, the dancing zombie resembled Michael Jackson from the music video "Thriller".^[26] Though the Jackson-inspired zombie was present in the game before Jackson's death, the estate of Michael Jackson objected to its inclusion more than a year after his death; PopCap agreed to remove the Jackson-inspired zombie and replaced it with a more generic disco-dancing one for all future patches and releases of the game.^[27] Ironically, a "disclaimer" in the game's almanac states "Any resemblance between Dancing Zombie and any persons living or dead is purely coincidental." Some Plants vs. Zombies advertisements parody controversial Evony ads, showing a drooling zombie instead of a voluptuous woman.^[28]

A planned name was Lawn of the Dead, a pun on the title of the George A. Romero zombie film Dawn of the Dead. For legal reasons it was changed to Plants vs. Zombies.^[21] It spent three years in development, and was released for the PC on 5 May 2009.^[19] Since it was released, it has been announced for multiple platforms, including PlayStation 3's PlayStation Network, Xbox 360's Xbox Live Arcade digital distribution service, Nintendo DS, and iOS.^[29][30]

The song "Loonboon" was inspired by composer Laura Shigihara's cat, which they named Metroid. She explained that the stage she was composing for was frantic, so she watched Metroid as he ran around the house, jumping off walls and playing with his toy mouse. "Brainiac Maniac" was inspired by older Capcom games, specifically those in the Mega Man series, describing its songs as melodic and complex. She was inspired to make the Plants vs. Zombies music video by her desire to make a theme song for the game. She specifically chose the Sunflower to be the one singing by wanting to have it communicating with the zombies. She later suggested that it be made into a funny flash video, and Rich Werner and Tod Semple, an artist and programmer, respectively, from PopCap came down and worked on it. Once it was completed after two weeks of work, the PopCap marketing team enjoyed it enough that it used it as a marketing tool.^[20] Previously, there were no plans to release the soundtrack as a stand-alone item, but Shigihara stated that she wished to do it, so she thought there was a good chance of it.^[22] In November 2010, Shigihara released the soundtrack through her Bandcamp page.^[31] Individual tracks are sold at USD1 per track or US$10 for the full album.^[32] It comes with a cover art designed by George Fan.^[31]

Plants vs. Zombies itself was referenced in "The Passing" campaign of Valve's fellow zombie game Left 4 Dead 2, in which the player can stumble upon in-game graffiti attributed to the character of Crazy Dave.^[33] A five-level quest chain culminating in a quest entitled "Lawn of the Dead" in the massively multiplayer online game World of Warcraft: Cataclysm is based on Plants vs. Zombies, using Warcraft elements to recreate the gameplay.^[34] Blizzard Entertainment had contacted PopCap about the inclusion, and Laura Shigihara was able to record some new music for the Warcraft version of the game.^[35]

Zomboni is a zombie riding a Zamboni, an ice-cleaning truck used to clean the ice surface in ice hockey. The zombie riding the Zamboni is a Canadian stereotyped zombie.

The game has 49 plants and 26 zombies.

Reception[link]

Reception
Aggregate scores
Aggregator	Score
GameRankings	88.6%
Metacritic	88
Review scores
Publication	Score
1UP.com	A-
Edge	9/10
Eurogamer	9/10
GamePro
GameSpot	8.5/10
IGN	9.0/10
PC Gamer UK	90%
Wired	9/10
Gamezebo

Plants vs. Zombies has received a positive reception from critics, garnering an aggregate score of 88/100 from Metacritic and an 89.5% from GameRankings.^[36][37] IGN editor Andy J Kolozsy commented that it featured a lot more content than other games in the genre, as well as praising its addictive nature.^[38] However, the DS version was criticised for its lower quality graphics and expensive price point.^[39] GameSpot editor Chris Watters praised the design of the plants and zombies, as well as the visuals and its overall value. However, he found fault in the learning curve.^[40] 1UP editor Alice Liang found the game enjoyable, commenting that the lawnmowers that protect the left side of the screen strikes a good balance between ease-of-use and indepth game play.^[25] Edge's review praised PopCap Games for adding an imaginative touch to every little detail of the game. He also credited them for taking the tower defense genre and making it their own.^[41]

Laura Shigihara's music video also received praise, with Hatfield attributing his interest in the game to the video.^[38] Liang also praised the song, asking how anyone could not want Plants vs. Zombies after seeing the video.^[25]

To date, Plants vs. Zombies is the fastest-selling video game created by PopCap Games.^[42] Plants vs. Zombies director George Fan estimated that half of the game's sales are from hardcore gamers.^[43] According to PopCap, the iOS release of Plants vs. Zombies sold more than 300,000 copies in the first nine days it was available on the App Store, generating more than $1M in gross sales, and considered it "the top-grossing iPhone launch".^[44]

Awards[link]

Plants vs. Zombies has been nominated for the "Casual Game of the Year" and "Outstanding Achievement in Game Design" Interactive Achievement Awards from the Academy of Interactive Arts & Sciences.^[45] The game received nominations in "Best Game Design", "Innovation", and "Best Download Game" for the Game Developers Choice Awards.^[46] Plants vs Zombies was picked by Gamezebo as one of the 'Best games of 2009'.^[47]

Legacy[link]

A Plants vs. Zombies board game was revealed at the 2011 American International Toy Fair. Being produced by Screenlife, the 2–4 player game is expected to be available in late 2011.^[48] A version of the game was added in patch 4.0.3 of World of Warcraft which used similar mechanics as a homage to the popularity of the game. A reward of a non-combat pet sunflower is given to those who can beat the minigame.^[49] The success of the game has led to the creation of Plants vs. Zombies lottery tickets.^[50] True Blood has referenced the game twice in Season 4. In Episode 5, "Me and the Devil", a guard in Bill Compton's office is playing the game on his phone, and in "Cold Grey Light of Dawn", a guard outside of Marnies' cell is playing the game on her iPad. Since the game was partially inspired by the Magic: the Gathering card game, a Magic card called Grave Bramble has been released in the Innistrad expansion. It is a Plant with the Protection from Zombies ability.^[51]

References[link]

• name=Android Market>"Plants vs. Zombies: Credits". Popcap.com. http://www.popcap.com/games/plants-vs-zombies/pc/readme#C. Retrieved 2010-06-30. 

External links[link]

• Official website
• Plants vs. Zombies at the iTunes Preview
• Plants vs. Zombies HD at the iTunes Preview