Error 259

About this game

Skill Based Gameplay


Large Variety of Characters and Playstyles


Fun and Powerful Items (Some even being references!)


Exciting RNG (Give into the gambling addiction)

Latest news

• Patch Notes·29 Oct 2025Official

  Optimization Update!

  Hi everyone! While recently working on Kitty Combat I came up with some new ideas on how to optimize the game, which some of it translates over to Error 259. That being said I remembered how some people would have fps issues and have about 30 fps most of the time..... which is like super bad. SOOOOOOOO, I just went back through all off Error 259's code and painstakingly optimized most of the main things that should be in theory slowing the game down. Just a reminder too, any updates will only effect the dlc/complete version of the game.👍 In other words, YOUR GAMES SHOULD NOW RUN MUCH BETTERRRR 🎉✨✨✨✨ Ps. Thank you all again as always for supporting me and my games! 😄
  Read full article on Community Announcements (Mini Rowan✨)

• Patch Notes·22 Aug 2025Official

  ERROR 259 REVIVAL UPDATE!

  Added a New Cultist Floor Boss Added a New Cultist Floor Enemy Added a New Glitch Floor Enemy Added 10 New Items Reworked/Changed a few items Made it where now you can see the items you have at all times (not just when the game is paused) Fixed the slider colors on the Main Menu Settings with the BSOD colors Fixed Bug where "Mysterious Camera" T5 item wouldn't work on Jolt Fixed Bug where Necromancy and Tombstone T5/TF would cause the shopkeeper and certain bosses to be invincible Fixed Bug where The Boiler Floor and Freezer Floor would sometimes overlap Updated Low Graphics mode to remove more effects for better performance Added Sex................................................tant (Sextant item XD) Keep in mind this is only available through the Blood & Bombs DLC
  Read full article on Community Announcements (Mini Rowan✨)

• Patch Notes·15 Oct 2024Official

  Blood & Bombs: Regular Update!

  Added Golden Chest to the Shop (Costs 25 coins and has a guaranteed T4 Item) Added 3 New Items Added Achievment for killing the rare testing scarecrow Buffed Lil Crusher Bot (can now stomp on spider mines) Fixed a bug where you could push mimics outside the map Fixed a bug with Reynolds and the Old Rifle Item Fixed a bug where the 2 new items didn't appear visually in your inventory
  Read full article on Community Announcements (Stefano_GamingAlt)

• Patch Notes·8 Oct 2024Official

  Blood & Bombs: Halloween Update!

  Added 2 New T3 Items Added 1 New Abandoned Factory Enemy Added some Halloween lights and decor to the shop (will be removed after October) Buffed Menacing T3 Item (Now activates twice as fast) Buffed the vacuum speed for The Scorched Boss, along with adding a new mechanic to that attack (Now spawns and pulls in fire projectiles too)
  Read full article on Community Announcements (Stefano_GamingAlt)

• Announcements·27 Aug 2024Official

  Error 259: Blood & Bombs DLC (Coming Soon!)

  Hello Everyone! I'm excited to announce that development on the Blood & Bombs DLC has officially started and will likely be done sometime midway through september or so depending on how smoothly everything goes. This DLC is planned to cost $5 and contains: 2 New Playable Characters (Vamp and Shell) 2 New Alt Floors (The Boiler and The Arcade) 20 New themed Items 10 New Enemies (5 for each alt floor) 4 New Bosses (2 for each alt floor) 50 New Room Configs for every floor Keep in mind also that while I continue to work on the game after this DLCs release I won't be able to go back and update the base game since it will be overwritten by this. Meaning that getting this dlc will also come with constant updates, new additions, and so on while the base game will not when it's done. The same is said when another DLC comes out, just saying this in advance to clear up any confusion. Basically just think of how The Binding Of Isaacs DLCs work.
  Read full article on Community Announcements (Stefano_GamingAlt)