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Currently there is only a Silverlight 4 version, but you can install it to your desktop by right-clicking on the games menu bar.
Game rules: Reveal all fields of the game board, which of course requires killing all monsters.
You can kill monsters of the same or a lower level to gain experience and level up.
Monster levels are: Rat (1) - Orc (2) - Minotaur (3) - Golem (4) - Dragon (5)
You can survive killing a monster of 1-2 higher levels but have to sacrifice hitpoints.

The game was inspired by Mamono Sweeper. (Japanese site, you may want to translate it via google.)

Get Microsoft Silverlight