Ultimate Mortal Kombat 3 (Saturn)/Hidden content

Looking back at this one, it's a bit dubious to include Shao Khan's treasures when accessing them is an inevitable consequence of winning the game rather than something truly hidden. I note we don't include things like the Space Harrier II options menu, it's a code on the title screen but it's also described in the manual so clearly a feature that the devs intended to be used to configure the game.

On the other hand, nowhere is it described what each of those boxes do, so you could argue there's value there. Opinions welcome!