Winter CES 1995 hunting brought up a result: https://retrocdn.net/index.php?title=File:SuperGamePower_BR_011.pdf&page=17 The screenshots kinda suck so it's difficult to pinpoint an exact build but they all have the same watermark... which suggests they came from a video, which in turn could suggest Chaotix wasn't playable at Winter CES 1995. And if that's the case, unlike Sonic 1 and 2, none of these prototypes would qualify as the "WCES build" (as in "the build you could play at WCES"). This matters because it reflects the development process. There seems to have been a conscious effort in Sonic 2 to always have something "presentable" when played normally, whereas in Chaotix, there's crappy placeholder menus and broken World Entrances. It suggests they weren't building up a hype machine by getting the kids to play demo versions, which again suggests a lack of faith compared to previous Sonic outings. The other thing is that the sound driver is broken in 1229 (the closest build we have to WCES 1995). With a video, you can cover that up, do there's no reference point for emulation (i.e. is Kega Fusion's audio correct) . Incidentally The February 1995 edition features (what looks like) the 1227 build, but again they talk all over the audio so it's not that helpful.