Zombies uses many cultural references in its names of stages and others. During testing, Fan found that minigame and puzzle modes seemed to detract from the focus on Adventure mode, so some of the additional modes and minigames were locked requiring advancement within adventure mode to become unlocked. Some ideas for the puzzle mode section would later be tweaked and moved into adventure mode 'Vasebreaker' and 'I, Zombie', for example, came from single-level minigame concepts. Upon finishing some items ahead of schedule, one of the programmers, Tod Semple, began working on ideas that would later be used for the minigame section. Programmers focused on Adventure mode for much of the first year of development. As a result, the balance between plants and zombies had to be restructured-a move that Fan said was definitely worth the effort. So, the price of the income generating sunflowers was dropped from 100 to 50 to encourage players to buy them over the attacking peashooter. ĭuring development, it was discovered that newcomers to the genre of real-time strategy may have a hard time learning the concept behind sun collection.
Originally, enemies were going to be aliens from Insaniquarium, but while sketching concept art, Fan drew a sketch of what he considered the perfect zombie, and the theming was reworked for plants to be fending off zombies. The game was initially going to be called Weedlings, but as the tower defense concept took off and the personality of the game as a whole evolved, the title was later changed. Zombies, and he found common tower defense game play elements such as mazing and juggling to be too awkward, causing him to use the five- and six-lane set-ups that were used in the final version. He wanted to bring something new to the genre with Plants vs. While he was looking at the towers in Warcraft III, he felt that plants would make good towers. 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. Strong strategic elements were included to appeal to more experienced gamers, while keeping it simple to appeal to casual gamers, without needing too many tutorials. Zombies director George Fan intended on balancing the game between a 'gritty' game and a 'sickeningly cute' game. At set points throughout the game, the player is either warned through a letter by zombies or addressed by Crazy Dave to prepare for an ambush, where the game takes on a bowling style, using Wall-nuts to bowl down zombies, or a modified version of regular levels, where random plant types come upon a conveyor belt, and the player can use the plants without spending sun. On the final level, the player must face a huge robot operated by a mad zombie scientist known as Dr. Later levels are nighttime pool levels (where fog fills the right half of the screen except when specific plants are used), a lightning storm level in pitch black (except when illuminated by occasional flashes of lightning), and rooftop levels. Other levels feature the backyard, with a pool added. The game starts out in a front yard and progresses to nighttime levels, where the gameplay is more challenging without any replenishing sun unless specific plants are used. The game uses several different level types and layouts.
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