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Chaos mode is a reimagining of an ancient gametype not seen officially in SRB2 since the Final Demo era. Unlike its predecessor, which was a simple and repetitive onslaught of enemies, this remake sees players completing timed objectives, exploring environments, and maybe even helping a friend or two along the way.

  • A cooperative gametype supporting both solo and multiplayer gameplay
  • Eight maps total; seven familiar, and one built from the ground up
  • Music: 4 new bgm tracks and 2 new jingles
  • Randomly generated spawnwaves
  • New enemy challenges, reworked enemy mechanics, and overhauled AI
  • Cooperative ring sharing mechanics
  • Automatic server difficulty scaling
  • Type chaos in console for a list of useful cvars and commands for players, server hosts, and modders
  • Supports most custom characters



In this mode, you must destroy egg capsules and other key targets before time runs out! Enemies and objectives appear in waves, and the level is completed once all waves are cleared.

Life is easier with company! Press tossflag to share some of your rings to an ally. If you don't have any rings, tossflag will signal to other players that you need help!

Heads-up display & more:



To configure ZoneBuilder for Chaos mode, simply add the main Chaos pk3 as a resource under SRB2 2.2 configuration settings. See the wiki documentation for more details on mapthings and mapheader settings.

For enemy configuration, two example pk3s have been included with Chaos mode, including lua documentation that can be viewed using SLADE.

Sonic Team Jr.
Maps: Greenflower Zone Act 1, Castle Eggman Zone Act 2, Noxious Factory Zone, Tidal Palace Zone, Infernal Cavern Zone, Celestial Sanctuary Zone, Frost Columns Zone
Main design, coding, audio
Music: Spring Yard Zone (Acts 1 & 2), Castle Eggman "Bridge" extended, jingles, MIDIs
Maps: Greenflower Zone Act 1, Infernal Cavern Zone, Spring Yard Zone
Textures: Spring Yard Zone
HUD: Radar code/graphics, combo meter code/graphics/sfx
Ice Face
Maps: Noxious Factory Zone, Frost Columns Zone
Textures: Spring Yard Zone
Sprites: Eggplant Capsule, Flying Saucer, Enemy Spawner
Maps: Celestial Sanctuary Zone, Castle Eggman Zone Act 2, Spring Yard Zone
Textures: Celestial Sanctuary Zone, Frost Columns Zone
Music: Frost Columns remix
Maps: Castle Eggman Zone 2
Code: Silver ring palette
Sprites: Bird statue
Sprites: Lilypad Capsule
Code: Copper ring palette
Music: Spring Yard Zone 2 MIDI bugfix
Dedicated server beta testing
Shotzo enemy
Splats enemy

Unless otherwise specified, request permission from the respective author for asset reuse. Music for Spring Yard Zone (Acts 1 & 2), Castle Eggman "Bridge" extended, win/lose jingles and all lua code may be reused freely.
Extension type
File size
8.4 MB
MD5 Hash
First release
Last update
4.75 star(s) 20 ratings

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Latest updates

  1. Version 2.2

    Contains some visual updates to the HUD, as well as a layout update for Noxious Factory Zone...
  2. 2.1

    Resolves a crash on Linux/Mac caused by certain enemies using special info.color arguments
  3. v2.0

    This update introduces a new minimap by Krabs, which replaces the old radar off to the side...

Latest reviews

not much to say that hasn't already been said. this is chaos, yes, but unlike the og, it's actually balanced and fun at the same freaking time. also spring yard zone???? instant selling point.
it's even better as custom characters (i can't explain it all here) though while i was playing as modern sonic at infernal cavern the framerate absolutely PLUMMETED. i'm not entirely sure why, it could be modern sonic or something else, but due to this i eventually quit playing that session.
i especially like the new bosses and "super badniks" i suppose. the super badniks keep fighting fresh and the same goes for the new boss attacks, especially the remade sea egg that deserves a chef's kiss. and let's not forget the support for custom maps and enemies existing, that's the best.
overall absolutely amazing gamemode
Upvote 0
this has been very fun!!! with two people we race against time to clear the map. as you play the easier it gets but still is great to play
Upvote 1
best gamemode to play with friends and stuff, but what is shotzo.pk3 and splats.pk3?
Upvote 0
This is pretty good what am i saying ITS AMAZING anyway i think its really cool concept you have 6 or 8 waves and you have to kill the bosses in each one i mixed multihit mod with this and i really like it bc it made badniks more challenging overall good job
Upvote 1
I absolutely love this game mode. I usually play as Modern Sonic which works pretty well. I also like to pair it up with Roll The Dice Deluxe for added fun.

The only complaint I have with this is during the last round, the framerate drops horribly down to like 5 FPS. At first I thought it was my crappy 2GB memory laptop, but then I played on my Samsung S21 and the frame drops still happened, so it can't have been a specs issue.

Aside from that, this mode is fun as hell for a singleplayer experience and dare I say preferable to the campaign mode. If the frame drops get fixed, it would get a five-star rating from me.
Upvote 0
personally, if you're bored of the vanilla gameplay formula, then THIS IS THE JAM
this is legitimately the best non-pvp gamemode i've seen that doesn't stray from srb2's base gameplay
the best part about it is that it also acts as a QOL mod, making enemy combat better by making enemies more aggressive overall and making the thz and gfz bosses ACTUALLY FUN (for the most part maybe not the THZ boss)
and nothing matches the feel of having an attraction shield, while super, and having collected all the rings so you get silver rings
absolutely amazing
Upvote 1
Easily my favorite custom gamemode I've watched this community create so far!
Upvote 0
Really cool but I keep lagging out and my fish goes like 2 frames per second and I can't play In 2 frames per second. Please help me
Upvote 0
Addicting! Send help plz!

But that Egg Slimer tho. It's very hard to kill it. :<
Upvote 0
I love Chaos mode. This mode is at it's best in single player (solo). I didn't enjoy it as much in an online game (with friends or randoms) but it is still enjoyable. Plus, the addition of Spring Yard Zone made it much better. Every other map (except for Tidal Palace Zone) are very solid maps as well (Techno Hill Zone is probably my favorite zone in this addon). It kinda suffered some of the issues with Battle mode in Kart racing games, but these issues are very small (and more noticeable in multiplayer) and can be overlooked. Overall, I love this mode and would recommend to anyone.
Upvote 0