Pixel Dungeon

Pixel Dungeon is a pixel-art roguelike that found enormous popularity, with more than two million mobile installs and a Best Singleplayer Game pick from SlideDB's 2013 editors. The goal is the genre standard: descend into the dungeon, gather useful items, fight fierce monsters and recover the ultimate artifact, the Amulet of Yendor.

It is easy to play but difficult to master. The dungeon runs 25 randomly generated levels across settings like sewers, an abandoned prison and caves, so every game feels fresh, and it is full of dangers, from hidden traps and deadly chasms to treasure chests, monsters at every corner and bigger bosses behind them. A deep pool of armor, weapons, potions, wands and scrolls awaits, with enchantments to apply, alchemy to brew rare potions, shops to spend coins in and demanding NPC quests to handle.

Several character classes, including the strong Warrior, the knowledgeable Mage, the sneaky Rogue and the powerful Huntress, suit different playstyles, and survive long enough and you can specialize a character further still. Pixel Dungeon is also open source and available on mobile.