Are the Illusion games like Mickey Mania? Which is the best (overall, outside refinement) including it? I didn't know they existed.
They're different. Mickey went through three general phases in gaming: the Illusion phase by SEGA (Castle of Illusion, World of Illusion, Land of Illusion on SMS) that were mostly traditional butt-stomper platformers of varying degrees of quality with astoundingly colorful graphics for the time. Then there was the Magical Quest trilogy by Capcom that was a little more complex platformer with weird throwing mechanisms and costumes with abilities and eventually multiple playable characters on top of the usual Capcom 16-bit polish and color. And the Mickey Mania (aka Mickey's Wild Adventure on PSX,) a one-off game by Sony Imagesoft / Traveler's Tales that was again simpler mechanics (you could fire I think they were marbles, but mostly you jumped and butt-stomped and avoided stuff) but with wildly advanced tech-demo graphics and a cool throwback story that tried to cover several Walt Disney works of Mickey. Each is a little different and has its own fans.
There were also a few NES and GB games featuring Mickey, but best not to speak of those in this good company...
I'm surprised that the PS1 version of Mickey Mania isn't on PlayStation Network, by the way. I'm not sure if it's Sony or Disney that owns the rights to this? (Probaby Sony, they published it, or co-signed it in the case of the SEGA versions.) From videos, though, it looks like the PS1 version kind of ruined itself, Psygnosis redid it with addiotional effects but for instance having polygon in the rotating tower just makes it look pedestrian rather than crafty. Doesn't seem like the rights could work out, but it'd be nice if Disney could do a classics run of Mickey Mania (SNES version on VC, Sega CD version on Xbox and maybe iOS/Android, I guess PS1 version on PlayStation Classics) someday.