Tip: If you give a Muncher tile custom graphics, it will still act like a coin when a silver P-switch is active, whether it looks like a coin or not. So make sure to use ExAnimation if there's a silver P-switch in the area.
? Block will a random item in it. You can configure the items in the table in the .ASM.
Note that the table must contain eight entries and that it contains map16 tile numbers, so there's some limits on what you can generate.
Tested with: SA-1 v1.31; snes9x v1.60; Lunar Magic 3.10; GPS v1.4.1
Works as intended. It's interesting how it works using the vanilla map16 acts like settings, as to not deal with map16 shenanigans... but a bit disappointing considering what it can generate (especially considering it's only one page only for all the choices. Not hard to change but still)