Undead Space

Difficulty: Hard

Undead Space is an achievement unlockable for the iOS and Android versions of Plants vs. Zombies. In order to complete it, the player must kill 10,000 zombies or more and then scroll to the edge of space on the Leaderboards screen. The player can keep track of their kills by going to the leaderboards.

Strategies
To earn the achievement, at least 10,000 zombies have to be killed in any way. Your pile on the Leaderboards page accumulates as you kill the zombies. Once you kill 10,000 or more, the pile grows up to the edge of space.

Good choices

 * Last Stand
 * Column Like You See 'Em (kills about 400 zombies each time)
 * Survival: Endless
 * Zombie Nimble Zombie Quick
 * Wall-nut Bowling 2
 * Whack a Zombie
 * Last Stand: Endless

To check their pile, you must tap on the leaderboards icon on the main page and scroll up on the pile or tap the top of the screen. You do not have to be signed into Game Center to see their score. Try playing those games over again. You might have killed less zombies than you think.

Note: Letting zombies die in any I, Zombie level will not improve your zombie total.

Trivia

 * When the player gets about 12,000 zombies, he or she will see the moon from Peggle Nights, another game from PopCap.
 * When the player gets about 16,500 zombies, he or she will see space rocks, or more exactly, asteroids.
 * At around 23,600 zombie kills, the player can see gems from Bejeweled, another PopCap game.
 * The limit is 30,000 zombie kills. After that, the zombies are sucked in a black hole and the pile does not get any higher, although the player's kills are still recorded.
 * The name of the achievement is a reference to the video game Dead Space published by Electronic Arts. (The un- prefix likely comes from the fact that the player fights zombies in Plants vs. Zombies and zombies are undead).
 * Despite the fact that most zombies' armor, arms, and heads fall off when killed, the zombies still have them in the pile.