Error 259 — patch notes and updates
Stored observation / content update:
Dated developer announcements recorded from Steam. Open the source for the complete update.
| Update | Date | Excerpt / source |
|---|---|---|
| Optimization Update! | 2025-10-29 | 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 sup |
| ERROR 259 REVIVAL UPDATE! | 2025-08-22 | 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........ |
| Blood & Bombs: Regular Update! | 2024-10-15 | 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 |
| Blood & Bombs: Halloween Update! | 2024-10-08 | 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) |
| Error 259: Blood & Bombs DLC (Coming Soon!) | 2024-08-27 | 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. M |
| Another Small patch | 2024-08-25 | Fixed some item descriptions Slightly tweaked some items Dimmed the explosive light and made it only appear on damaging explosions (like landmines, explosive shot, barrels, and so on) |
| Small patch | 2024-08-24 | Fixed some small visual bugs |
| Error 259 5.3 Update! | 2024-08-23 | Finally reached the final base game goal of 259 Total items! (118 New Ones!) New mechanics and features with a lot of the new items More Special Item Synergies Added a 5% chance for a floor to be at "Night time" which will make the rooms have a night shader applied to it Added Light Flashes on explosions and gunshots for certain weapons Added more hats to some of the old items Reworked the Zookeeper achievment since there are way more companions now Updated/Improved Several Boss Cards standard balancing and small fixes Updated Credits Removed unused files to reduce game size This is the final Major update for the base game of Error 259, soon |
| Error 259 OMEGA Update | 2024-08-03 | Added the last 3 Bosses for the base game Added the last 2 Enemies for the base game Added significantly more props and other visuals to make rooms feel more in depth and detailed Added 1 New Item Added the last 40 room configs on each floor for the base game Updated the previous room configs with new props and enemies General balancing with enemies, bosses, and items Added the 10 winning skins from the Reskin Contest Updated/Improved some of the current skins Small bug fixes |
| Visual QOL changes | 2024-07-29 | Changed boss room floor to match the floor you're on Added a floor decal that can randomly appear in some Factory Floor room configs to fill up more negative space Slightly changed colors of explosions Fixed some small visual bugs |
| Updated Multiplayer and Bug Fixes | 2024-07-27 | Significantly updated online Multiplayer (there are a still a lot of known bugs and issues but it should be a lot less glitchy than before) Fixed a couple small bugs and visual changes |
| Small Bug Fixes and Changes | 2024-07-25 | Updated store page assets Added a shockwave visual effect for The World T5 item Fixed some positions for new room configs Changed oil/ash from enemies to no longer move from conveyors (originally I thought it would look good but turned out it didn't at all lol) Fixed a movement bug with the Monitor type bosses Fixed tint for some boxes on different floors Fixed an audio bug with the phone in the shop other small fixes |
| Quick Patch | 2024-07-24 | Fixed a position of a healing pylon in one of the new room configs (I accidentally swapped it's X and Y coordinates originally) |
| Chests and Conveyors! | 2024-07-24 | Added Conveyor Belts Added Chests (contain 3 coins and a health potion, opened by touching or shooting) Increased the max Player Speed to 450 (was 400) Added 3 new items Added and updated 10+ more room configs for each floor (50+ total) Re-sprited Snow decor in Freezer Floor Some bug fixes |
| More enemies! | 2024-07-23 | 3 New Enemies Updated enemy guide Nerfed Turret Face firerate Updated Room Configs Various other bug fixes |
| Spooky Scary Skeletons! | 2024-07-23 | New skeleton skins for different floors (Necromancy T5 Item) Changed the color of the text in the Character Select to now be white so it's easier to read and pops out more Changed the power descriptions for locked characters to now say how to unlock them, and made the dark film over them a lot more visible Changed the dash for low fps again (now I-Frames last longer but no longer pushes you forward) Updated achievment descriptions for unlocking some characters to make it easier to understand Various other bug fixes |
| Bug Fixes | 2024-07-22 | Updated the visual for the version number on the main menu (forgot to the past few times) Fixed visual issues with character skins Various other bug fixes |
| Byte Rework! | 2024-07-22 | Completely Reworked Byte's gameplay and ability (no longer has a revolver and a passive damage buff toward bosses, along with no longer only being able to get almond water. Now has a suppressed pistol and the ability to go invisible for 8 seconds, non shop items are now a 50/50 between Enemy Intel which gives a 0.5 damage up or Brief Case which gives +10 max coins and 5 coins) Improved low fps dash updated low graphics mode Buffed Byte's starting firerate (was 0.6 and is now 0.5, also you no longer have to tap fire as him and can hold down the shoot button now) |
| Big Bug Fixes | 2024-07-21 | Fixed and buffed Jolts ability (now also applies a small permanent speed reduction to enemies in the room) Fixed chase enemy ai Added an FPS counter to the top right Fixed low graphics mode brightness Changed the dash to now become more of a parry when below 30 fps to prevent glitching through walls slightly increased the dash cooldown |
| Jolt Rework! | 2024-07-21 | Jolt's Gun Rework (No longer works on a reload system and now has an overheat, also includes the gun changing color to show your current temp level) Non copyright music added for the Freezer Floor Updated and reorganized Boss and Enemy Guides Lots of bug fixes |
| The Stack Grows | 2024-07-21 | 2 New Items 1 New Boss (Super Stackbot) 1 New Enemy Updated room configs Improved optimization for low graphics mode Bug Fixes In the next update I'll add the new boss and enemy into the guide book ːsteamthumbsupː |
| Small Patch | 2024-07-20 | Made it easier for me to add more skins in the future Fixed bug where multiple songs played at once Fixed the bugs with the new roof configs and skins Fixed the spelling errors in the boss guide |
| Character Skin Competition | 2024-07-20 | This is a small art competition where people can submit reskin designs of the characters in Error 259 and one for each character will be chosen to be added into the game. Rules These are specifically reskins, they are not meant to change the shape or silhouette of the characters The sprites must be 24x24 (the original canvas size) You can submit as many skin ideas as you want, just don't spam the same one over and over No NSFW or excessive gore Just be kind and have fun If you need the original sprites for each character you can join the Discord and they'll be pinned in the Reskin Competition text chat! Error 259 Discord |
| Thank you all for the support! | 2024-07-20 | 4 new enemy types! Updated Enemy Guide Added new room configs Nerfed Shadow Seeker teleport speed and distance, also made the room light bigger Slowed the speed of boss room projectiles a small amount to make them a little easier to dodge Optimized game storage size a bit A few small bug fixes I just wanted to say thank you all again for playing my game and giving me so much helpful feedback! It really helps make this game better and better with each update and I love working with my lil community to add new things and ideas. It makes me so happy seeing how far Error 259 has come and finally seeing it all come together just as I hoped! Thank |
| Survivin With Style! | 2024-07-20 | New special reward for beating all 3 endings with a character! Added working link icons to the main menu (Discord, Youtube, Spotify, and Patreon) Buffed Jackpots ability (increased chance of getting a T4, can now get TF items, but can't get T3s anymore) Added a new boss to the abandoned factory floor Added a sound effect and screen shake when the Screen Saver boss hits a wall Updated Boss Guide Fixed the boulder sprite for the Crusher Bot Fixed a visual bug with BSOD's ability Fixed several small bugs |
| Under New Reign! | 2024-07-20 | New Final Boss New Floor: Glitched Plains (ending floor meaning runs are no longer endless) New Game Mode (Endless Mode) 12 New Achievements 1 New ending for each character + New Completion Mark Changed Boss music to fit the floor you're on (also fixed shop keeper boss music) Updated low graphics mode Updated Boss Guide Book Normal bug fixes |
| Boss Guide Book Update | 2024-07-17 | 2 New Items Updated the guide on the main menu to have it's own selection screen and added a Boss guide to it Improved closing animation for Railgun, also made it's rotating speed more consistent Slightly improved the Guide book sprite Re-sprited and nerfed firerate for Crusher bot's and The Chosen One's room projectiles Fixed bug where Big Snow Bot wouldn't have room projectiles |
| Enemy Guide Book Update | 2024-07-13 | 1 New Item Added a guide on the Main menu that has info about every enemy (soon I will also add a section for all the bosses and items too) Lots of bug fixes |
| Some quality of life stuff :D | 2024-07-13 | Added a Game Over/Score screen when you die Added new obstacle/terrain (Pit) Added 10 New room configs for each floor Adjusted some of the current room configs Made Item displays only visible when the game is paused (this makes the screen less cluttered and allows you to see more items now) Buffed SugurPlum (heal cooldown is now 15 seconds rather than 30) Fixed some new items not showing up in item displays |
| Half way to 259! Part 1 | 2024-07-11 | 23 New Items! Added 2 New Songs, now each floor has it's own theme Added a hat for the Devil's Horns T5 Item Nerfed the max speed cap to 400 (was 450. This is mostly to reduce accidental clipping out of the map) Nerfed chance of getting T5 in the shop (was accidentally about 12% chance, is now the intended 5%) Buffed Broken Dial (Only sets firerate to 0.2 if you have worse, and if you have better then it will switch to a damage up) Boss Health Number is now shown on their health bar Re sprite for melee weapons, Cryo, , Burst Ice Gun, most bosses, most Boss cards, and some terrain. Fixed a bug that would allow infinite boss items Fixed the Den |