If you like zombie games as much as I like them, then this list is really designed for you, since I've been collecting only the best zombie games to play in flash format for quite some time.
Plants vs Zombies
While it is not my favorite at all, I could not miss this simple but entertaining game of plants vs zombies.
The last Battle 2
The last battle is undoubtedly the best game created of zombies in flash format, since in it you must worry about things like looking for survivors, obtaining weapons and improving barriers in general. No doubt a game that you must play yes or yes.
The last battle 1
There is so much difference between the other zombie games and the last battle that the first installment of this game, occupied my second place.
Zombie Outbreak 2
A game of zombies quite typical, but very well achieved, game in which you must go attacking practically everything that appears to you ahead. It is a platform game.
Days 2 Die
In a sixth place is this entertaining game, which on a 2d platform you will have to defeat all the zombies that appear.
2 Player Zombie Game
If you like zombies and want to play with two players (a friend and not online), I think this game is the best you can find in a long, long time.
Box Head - More Rooms
If you like to shoot until you can no longer, this game fully meets what you need.
Labyrinth and Zombies
Labyrinth and Zombies, although in the beginning it was one of those games that I really did not like too much, after playing it for a while I found that it was quite a fun game to play. You have to try to get out of the maze by defeating all the zombies that appear ahead of you.