Simpleton is another fun zombie game in which your objective is to destroy all the attacking zombies and monsters to proceed to the next level. Pick up weapons and powerups and use them to fight your attackers. A good strategy would be to fire while retreating since most of the zombies are slow.

Play the Bad Moon Rising Halloween game which is a creepy Halloween shooting game with funky graphics. Enter the graveyard at your own risk and try to get to the haunted house without getting yourself killed. Shoot attacking vampire bats, ghosts, skeletons and pumpkins before they get you in this free Halloween game!

Days of The Dead is a fun fantasy defense game in which you must survive for 13 days while your village is being attacked by an undead army. Shoot your bow from the top of your castle at the advancing undead horde. As each enemy wave attacks your castle, they will get stronger and stronger, you will face many undead monsters including armored zombies, skeletons firing bows with arrows which have been set on fire, huge undead beasts and many other undead monsters.
Use your bow to shoot your invading enemies from the castle walls. Upgrade your weapons and get your hands on rare powerful items to help you battle the undead menace. Learn powerful spells and use them wisely in the heat of combat to defeat your enemies. Have fun playing this awesome zombie defense game.

13 Days In Hell is an awesome shooting game. In this free online game, you have to survive 13 days in hell battling zombies.