Henger83 has gotten a hold of a rare pre-release version of Rockman X4, and we're dumping the game here for everyone to play and explore. Available to download in the links below, you're now free to enjoy the game to your heart's content or rip it open for the sake of research.
Part 1: http://www.megaupload.com/?d=15R2WXNA
Part 2: http://www.megaupload.com/?d=VLP9E6W9
Part 3: http://www.megaupload.com/?d=2FANE8E0
Rockman X4: Special Trial Version is a bit of an oddity. It isn't your run-of-the-mill prototype, smuggled outside of Capcom territory. It's a demo disc. A demo disc that Henger and I have never seen before. An early version of X4 is the crown jewel here, but the disc also contains demos for Rockman 8 and Rockman Battle & Chase. Nothing too spectacular from those two, but X4 is oozing with a tiny differences including unused enemies, unseen graphics, and a number of other aesthetic differences. Oh, and early Split Mushroom music.
The demo consists of four playable stages: Web Spider, Magma Dragoon, Jet Stingray, and Frost Walrus. The stages themselves have slightly different layouts from time to time, each sprinkled with their own subtle differences. Frost Walrus' stage, in fact, contains a section that was removed from the final game entirely!
Those capable should try to dig around inside the game. There may be all sorts of other mysteries just waiting to be unearthed. If you discover anything of interest, please do share your findings in the comments!