Mamono Sweeper
It's what you get if you cross Minesweeper with an RPG. Like Minesweeper the goal is to clear the board, but you've got to defeat the monsters not just avoid them. The numbers tell you the level total of the monsters in the surrounding square (so a 3 could be one level 3 monster, or three level 1). You can instantly defeat monsters of your level or lower. Higher level monsters will do damage to you. Once you've defeated a monster you can click it's icon to see the number for that square (and click the red number to show the monster again).