Monsters Killing Category:Online Action Games Description: Waves of monsters gonna destroy your valuable gem. See how you can defend your gem.Move mouse to kill the monster with blade. You will see that your magic power in the Blue Magic Bar below is increasing as you kill more and more monsters. When the magic power is accumulated to a certain amount, you can click Left Mouse and Spacebar to use your magic power. This game is online. Tags: Instructions: Check inside the game for instructions on how to play Monsters Killing.