Game url:
http://www.qigames.com/game/zombie-madness-the-awakening/play.php

Hacks:
key 1- cash
key 2 -upgrades points
key 3 - toogle life
key 4 - toogle ammo

Game url:
http://www.dailyfreegames.com/flash/action-games/kilroy-3-return-to-chernobyl.html

Hacks:
infinite life and infinite ammo

Game url:
http://www.juegosdiarios.com/juegos/kilroy-3.html

Hacks:
vida infinita y cargador infinito

Game url:
http://www.tomsgames.es/13970-jugar-last-line-of-defense-first-wave.php

Hacks:
infinite life and infinite cash