This page details one or more prototype versions of Knuckles' Chaotix.
Check the remaining prototypes for any notable differences. This thread should be a very useful starting point.
A huge number of prototypes for Knuckles' Chaotix were leaked on February 23, 2008 by drx as part of his massive Sega Archives leak. These largely seem to be late in development as a result of being part of Sega's Quality Assurance BBS archives.
In addition to these prototypes, some leftover data from a later build of Sonic Crackers has been found in the prototype of Yuu Yuu Hakusho: Makyou Toitsusen.
| Sonic Crackers|
Dated April 1, 1994. Before there was Chaotix, there was Crackers.
| 1207 Prototype|
Dated December 7, 1994. The earliest leaked prototype of Chaotix, with a very different...well, almost everything.
| 1227 Prototype|
Dated December 27, 1994. Several new things, but still a bit unfinished.
| 1229 Prototype|
Dated December 30, 1994. Not much interesting, to say the least.
| 0111 Prototype|
Dated January 12, 1995. The earliest available build that actually works...sort of.
| 0119 Prototype|
Dated January 19, 1995. A slightly later prototype, with slightly fewer differences.
| 0202 Prototype|
Dated February 7, 1995. The first build with an ending.
- According to Sega of America CEO Tom Kalinske, Knuckles' Chaotix was at one point developed for the Sega Saturn as a mainline Sonic title. Given the considerable length of time that passed between Crackers and the 1207 prototype, it's entirely possible that there are further Chaotix prototypes from when it was developed on the Saturn.