Monster Realm is a classic match 3 game. In this game you need to change all the blocks from dark to bright. Each time you swap and make a set or 3 same monster the block related to them becomes brighter. You can not swap a locked block. To unlock it you must make match with locked block by swapping other neighbouring blocks. Make all blocks bright blue to win the level.
You can play this game by mouse. To swap blocks either click on 2 adjacent block one by one or just drag a block on its neighbouring block.