Beta version of World of Illusion (starring Mickey Mouse &amp; Donald Duck). The game that I played when I was a kid. When I search Google, I found the site

http://randomhoohaas.flyingomelette.com/WorldOfIllusionBeta/WorldOfIllusion-Main.htm

Here's ROM of World of Illusion beta.

http://www.romnation.net/srv/roms/50740/genesis2/Mickey-Mouse-World-of-Illusion-Beta.html

In gameplay, no sound but music, level select, can moving around after press Start and the players' characters were invincibles.