http://www.hojamaka.com/game/mamono_sweeper/en.html
Basically, this game is laid out on a grid like Minesweeper. When you click a square it reveals what is there, or a number. Unlike Minesweeper, the number is the sum of the monster levels. As you kill monsters, you gain levels, thus allowing you to one-hit-kill stronger monsters.
It's less frustrating than Minesweeper, because:
* You can get the number under a monster's square by clicking on its corpse.
* When you're first clicking the board to get started, you're unlikely to actually die if you mess up.
* You can safely click all squares surrounding a number <
= your level.
There are other difficulty levels as well, but this is the only one I've tried.
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