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Walking dead, pvz

L4D2 and PvZ :D

Pokemon

Left 4 Dead 2 :)

dead island and l4d2

Killing Floor, hands down.

1 - kf
2 - DI
3 - l4d2

Left 4 Dead 2, Dead Island

Killing floor has mutants, not zombies >:C

Anyway, killing floor

Cry of Fear (HL1 Mod)
Half Life (All of them)
And Minecraft xD

Rebuild 2 is fun: http://www.kongregate.com/games/sarahnorthway/rebuild-2

The Last Stand series: http://www.kongregate.com/games/ConArtists/the-last-stand

Killing floor and Resident evil:Operation Raccoon city (the best 34 euros i've ever spent)

PVZ