Posting for drx, but some more prototypes have been released today (especially since this was originally posted, heh).
High Seas Havoc (Early prototype)
Mickey Mania (Sep 1994 prototype)
The High Seas Havoc one is pretty interesting. It's early, but all the level designs are implemented save for the object layouts in most of them (even for the first level for some reason). It seems to be using a test object layout for the stages that lack object layouts, which you can see in the video for the first stage. There's also some palette changes too.
The Mickey Mania prototype is later than the one that was released years a go by SNEAKERS. I mentioned as many visible differences in comparison to the final by comparing the two ROMs together but I didn't play through the entire game. I do know that the level before the final boss works, and the final boss level itself lacks the actual boss even though the stage will load. It's missing that unused song from the earlier prototype, and it actually has a title screen this time (which looks different). Thankfully, level select is enabled by default in this build.
Speaking of level select, I mentioned about a year a go that I discovered the level select code for the earlier build on the talk page of the article. As it turns out, the code was changed so that it would be impossible to normally access the level select even if the correct method for accessing it were used. So I had to write a Game Genie code to access it.
Mickey Mania (Jul 1994 prototype)
The Game Genie code is RECA-E6WC for those that wanna try it. I mirrored the build on HPZ and added a reference to the TCRF article as well. I figured out a possible 'date' for this ROM by looking at the timestamps on the original scene release and was surprised to discover it was packaged in early August of 1994. So the ROM itself could be from July. The date for the build released today was determined by the month/year in the header (which happens to be SEP/94, whereas the final is OCT/94 I think). So I'd imagine that the date for it is closer to the beginning of September or last weeks of August.
Coincidentally, I noticed that the Mickey Mania prototype released by drx back in 2011 for the Sega CD is timestamped to the last week of August in 1994, still before the release of the game and the final build date as well. I noticed that the prototype for the Sega CD shared some similarities with the prototype released today for the Mega Drive, mainly in the text changes. The only big difference is that the final boss is actually implemented in the Sega CD prototype, but isn't in the Mega drive one released today.
(Also in case anyone missed it, even though it's not Sega related, some Lion King SNES prototypes were released earlier this month as well)
This post has been edited by evilhamwizard: 25 February 2017 - 06:00 PM