Sega Master System / Mark III / Game Gear
There is a level select and SFX test but it has been deliberately removed from the final ROM. There are several ways to reinstate it:
00C00802. Switch the PAR on and off to enter the sound test.
01at ROM address
00077B01(in an emulator that supports it - it won't work on a real cartridge).
The last two set the cheat code to + or +, which must be pressed during the "(c) 1991 The Walt Disney Company" screen.
It is possible to choose scene numbers too high for a given round, in which case you will get the level data from a higher round with the block types and graphics of the selected round.