Shattered Pixel Dungeon is a Roguelike RPG, with pixel art graphics and lots of variety and replayability. Every game is unique, with four different playable characters, randomized levels and enemies, and over 150 items to collect and use. The game is simple to get into, but has lots of depth. Strategy is required if you want to win!
Based on the source code of Pixel Dungeon, by Watabou.
Addictive. Eventually you beat this game and you feel great knowing that your skills improved during all the previous failed attempts.