Isaac's Basement, inside your Black Ops III: spikes, pits, fire, poop, a shop, and a map.
A floor from Isaac's Basement, played in your Black Ops III, solo and offline.
Each run generates a new floor: original rooms, a treasure room, a shop, and Monstro. Doors stay locked until you clear the room. A side room may be locked.
You'll find Isaac's stuff in the rooms: rocks, poop, spikes, pits, fire, spiderwebs, monsters, and pickups. The pits are real pits. Bombs, using the Lethal button, blow up rocks, poop, and TNT.
Isaac's monsters stand in the room and move around rocks and pits. Twelve items change your soldier and weapon. The shopkeeper sells items for 15 coins.
At the top, you'll see hearts, coins, bombs, keys, damage, speed, tears, range, and the floor map. Movement is more restrained: no wall running, sliding, or double jump. Hold Use to switch from first to third person.
The first time, the game prepares the rooms (about a minute and a half), then Black Ops III opens directly into the game. You'll need your own copies of Black Ops III, the Mod Tools, and The Binding of Isaac: Rebirth. The download doesn't contain anything taken from those games.
Made with Codex and Claude. The Binding of Isaac: Rebirth is by Edmund McMillen and Nicalis. Black Ops III and the Mod Tools are by Treyarch and Activision. Reading Isaac's archives uses Gibbed.Rebirth and Gibbed.IO by Rick Gibbed (zlib license) and SharpZipLib (GPL with linking exception).