Mickey Mouse Illusion trilogy

[Will]

I knew nothing about the hidden treasure chests locations. Great finding. In time I shall remap the entire game, but this time it will be replaced with the game gear version.

[Maxim]

There may be more (only by hacking the game can we be sure). There are also some in Castle of Illusion, also listed on the Sega Notebook site; I'm not familiar with Legend of Illusion.