Play Grey Matter Game and wipe out the enemy nested within a brain, get shield upgrades and extra lives to give you an edge. Full instructions in game.
Grey Matter is one of many Shooting Games to play online on your web browser for free at KBH Games. Tagged as Chain Reaction Games, Grey Games, and Shooting Games. Upvoted by 13 players. Other games you might like are Three Shades of Grey and Grey Box Testing. No download or installation needed to play this free game. Hope this game brings a little joy into your daily life.