Tip: Layer 3 backgrounds and tides disappear when you hit a message box, so plan your level around that. For example, you can add a sublevel without layer 3 at the start/midpoint, and include your message there.
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Details for Super Mario Advance 2-Styled Yoshi Blocks
SMW Patches - Super Mario Advance 2-Styled Yoshi Blocks
Makes the Yoshi question blocks act similar to Super Mario Advance 2, giving you a different yoshi color based on powerup status and wheter the specific-color Yoshi has been obtained. Read the ASM file for more info.
Note that, in the occasion that RNG is used to determine the Yoshi color, SMW's default routine doesn't do a nice job, usually yelding the same value through various runs. I recommend using this routine instead.
Requested by KingKoopshi64. Special thanks to SubconsciousEye for telling me the exact behavior of the blocks!