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Help with game title please

Posted: Thu Jul 12, 2018 11:28 pm
by Antdav
I've got the equivalent of an ear worm but for an old game. I've YouTube'd for hours and got nowhere.

It's a platformer/adventure style game.
I'm thinking 8 or 16 bit generation but as one of 3 brothers we had pretty much every console and handheld since the 2600.
I recall the character changed forms when entering a new area and I think if you went left from the start (which was novel) you turned into a mouse or snail to climb a big wall before exploring that area.

Poasibly there was also castle which was hovering above the ground but I could be combining 2 different games.

Any ideas that aren't wonder boy 3?