The Binding of Isaac

The Binding of Isaac is a top-down 2D dungeon crawler game in which the player controls Isaac or one of six other unlockable characters as they explore the dungeons located in Isaac's basement. The game's mechanics and presentation is similar to the dungeons of The Legend of Zelda, while incorporating random, procedurally-generated levels.

On each floor of the basement dungeon, the player must fight monsters in a room before continuing onto the next room. Along the way, the player can collect money to buy equipment from shopkeepers, keys to unlock special treasure rooms, and new weapons and power-ups to strengthen their chances against the enemies. Each floor of the dungeon includes a boss which the player must defeat before continuing to the next level. On the sixth of eight floors, the player fights Isaac's mother; after defeating her, Isaac crawls into her womb. Later levels are significantly harder, culminating in a fight against the heart of Isaac's mother on the eighth floor. An optional ninth floor, Sheol contains the boss Satan.

The series includes:

The Binding of Isaac (2011), The Binding of Isaac: Wrath of the Lamb (2012), The Binding of Isaac: Rebirth (2014).