Paperbag Dungeon

From BoardGameGeek:

Paperbag Dungeon is a tile-laying dungeon builder, with elements of "tower defense," hidden puzzles, and resource management. Each turn you will choose a card to add to your dungeon. Build carefully because one wrong tunnel could let in monsters that have the ability to dig through walls, open doors and crash your Dungeon Gate. Mechanincs include: Tower Defence with randomized monsters, flip cards to upgrade defenses and mine gems,map building, hidden pictures, and logic puzzles.