Online (open beta)

Online is an in-development mode exclusive to the Repentance DLC and PC that allows players to play Co-Op with other people on different devices. Players may choose to play with friends on Steam or be randomly matched with other players.

Online mode is currently available with Repentance+. The initial plan was to open the beta the first two weeks of every month but Tyrone made the decision on February 2, 2024 to shut down the beta.^[1]

WARNING: Repentance+ online co-op is still in a beta state. It may be unstable and can sometimes corrupt your save data. Play it at your own risk. You can always turn off Repentance+ content in Steam's DLC manager, and the game keeps a backup of your pre-Repentance+ save files.

Changes

Online mode uses most of the same game rules as Repentance Co-Op but with the following changes:

Destroying Boss Room items through Abyss, Eternal D6, Tainted Cain, Void etc., will no longer prevent further items from spawning.
- Silver Treasure Room items in Greed/Greedier mode behave the same as Boss Room items.
Co-Op Ghosts can fly over pits and obstacles, open Chests and Grab Bags, and pick up Pennies, Bombs, and Keys.
- Co-Op Ghosts have their damage reduced to 20% and their other stats are reverted to base.
- Co-Op Ghosts can revive themselves by picking up an Eternal Heart.
Giving coins to Revive Machines will revive dead players without needing to beat a boss, requiring 10 coins for the first revival.
When moving to another room, the door entered is closed for one second.
Enemies and bosses, such as Eye, The Bloat, or Gabriel, now have an indicator on where they will fire their laser beam in rooms larger than a regular 1x1 room.
Players can communicate through a chat-box or through the Emote Wheel.
Players can restart a run if all players hold down the R button.
Upon successfully completing a run, all players will be sent to a Deathmatch mini-game.
Following a run's end, each player is given a select list of "Sins" which are titles that are given depending on the player's actions that run. The amount of times a player has earned a Sin can be checked in the Stats page.
Full list of Sins:
- Eternal: Killed a boss with a ghost baby shot
- Heartless: Didn't pick up any health
- Envious: Died to a Blood Donation Machine, Devil Beggar, or Devil Deal
- Dressed Up: Transformed the most (minimum 2)
- Prideful: Picked up the fewest items
- Savior: Revived the most allies (minimum 3)
- Wrathful: Dealt the most damage
- Big Boss: Dealt the killing blow to the most bosses (minimum 5)
- Explorer: Opened the most Secret Rooms (minimum 3)
- Expressive: Emoted the most (minimum 10)
- Gluttonous: Took hearts while other players had significantly less health
- Reckless: Damaged other players (minimum 3)
- Escape Artist: Teleported out of a Challenge Room, Boss Rush, I AM ERROR Room, or Curse Room (minimum 2)
- Gambler: Gambled the most at a Slot Machine, Crane Game, or Shell Game (minimum 20)
- Greedy: Picked up the most coins
- Mystic: Used the most tarot cards (minimum 5)
- Pill Popper: Took the most pills (minimum 5)
- Big Spender: Spent the most money in Shops
- Janitor: Destroyed the most Poops and Fires (minimum 10)
- Lustful: Took the most damage
- Slothful: Killed the fewest monsters

Notes

An online run's save file uses the player's who has the least unlocks completed.
- This means that if one player is missing an unlock, then all players will be missing that unlock.
- The Donation Machine uses the amount of that save file.
- Character unlocks, such as The Lost's Holy Mantle, are determined on a per-player basis. This includes the Holy Mantle from the white fire in Downpour / Dross.
When a player joins a game that is in progress, they join automatically at the start of the next floor.
Achievements are enabled, unless joining in the middle of a game, where a special icon will tell that achievements are disabled.
Previously, when waiting in a lobby in online mode, text would display at the bottom stating the current status of the run and the floor that it is on. This feature is not present in the current version. Texts displayed were:

Fighting Boss in [Floor]: Players are fighting the boss. Waiting players spawn after end trapdoor entry.
Fighting a Miniboss in [Floor]: Players are fighting a miniboss.
Looking to the stars in [Floor]: Players have entered a Planetarium.
Collecting treasure in [Floor]: Players have entered a Treasure Room.
Shopping in [Floor]: Players have entered a shop.
Exploring [Floor]: Players are in any normal room.
Found a Secret in [Floor]: Players are exploring one of the various secret rooms.
Praying to the angels/Making a deal with the devil in [Floor]: Players have entered a devil or angel deal.
CURSED! in [Floor]: Players have entered a cursed room.
Playing in Isaac's room in [Floor]: Players have entered a bedroom.
Rummaging below [Floor]: Players are in a crawlspace.

Victory Laps don't disable achievements.
This mode adds a new pause menu only found while playing online.
- Completing a mark in Normal/Greed Mode turns the bloody border around the mark blue, and completing it in Hard Mode/Greedier Mode turns it purple.

Gallery

The pause menu found only while online.
The blue and purple completion marks found online, alongside the normal single player completion marks.

Trivia

Doors closing behind players was added in a later build of the online beta to prevent people fighting over where to go.
During early beta testing, options usually available in single player are unavailable when playing online, such as switching modes and entering seeds.
- Prior to the beta’s closure, modes were rotated in each beta. December 2023’s beta was Normal Mode only, January 2024 was Hard Mode only, and February 2024 was Greed Mode.
  - It was technically possible to play in Hard Mode in the December 2023 beta due to Victory Laps.
- There was an option to switch modes, however it was unable to be interacted with.