Uploaded October 2018 | Updated September 2026, 2 weeks ago

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At the beginning, it was necessary to get the shell in a lower slot than Yoshi's, so that I could grab it in Mario's hands while riding him. That was done by spawning a couple koopas and the turn block bridge before the shell.
After the time-up glitch, I did a trick to duplicate the yellow shell. I needed 3 shells to triple-stun and there were only 2 shells in reach, so a duplication was needed. Basically, Yoshi licks the shell offscreen and pushes it to the despawn zone (allowing a new shell to spawn at the spawn zone), but when his tongue retracts the shell materializes back in his mouth.
Then, the first stun glitch was performed - the turn block bridge spawned a vertical green net koopa. I used a coin to item swap the Yellow shell from its spawn zone. The pause and the screen scroll were done to manipulate Mario's fireball active frames, so that it passed by the net koopa without burning it.
Then the second stun glitch was done and the net koopa went to Yoshi's mouth. I only licked it for 1 frame, so that it didn't get properly eat canceled and Mario's cape could still hit it, which is useful because it sets a very high value to its stun timer.
After dropping the stunned net koopa, I had to stay in a very tiny spot where neither the naked blue koopa at the right and the turn block bridge at the left could spawn, otherwise there would be no free slot for the para bomb, which was spawned when the net koopa's stun timer reached 4. Then, the last stun glitch was made to spawn a Reznor from the para bomb, and since Yoshi was in slot 4, spitting out his tongue ended the level.

List of levels that have been cleared without pressing A or B:

-Yellow Switch Palace
-Yoshi's Island 2
-Yoshi's Island 4
-Donut Plains 1 (both exits)
-Donut Plains 2 (both exits)
-Green Switch Palace
-Donut Secret 1 (both exits)
-Donut Secret 2
-Donut Plains 4
-Vanilla Dome 1 (both exits)
-Vanilla Dome 2 (normal exit)
-Red Switch Palace
-Cheese Bridge Area (normal exit)
-Soda Lake
-Cookie Mountain
-Vanilla Secret 2
-Vanilla Secret 3
-Butter Bridge 2
-Forest of Illusion 1 (both exits)
-Forest of Illusion 2 (both exits)
-Blue Switch Palace
-Forest of Illusion 3 (both exits)
-Forest of Illusion 4 (both exits)
-Forest Secret Area
-#5 Roy's Castle
-Chocolate Island 1
-Chocolate Island 2 (both exits)
-Chocolate Island 5
-Chocolate Secret
-Valley of Bowser 1
-Valley of Bowser 3
-Valley of Bowser 4 (normal exit)
-Star World 2 (both exits)
-Star World 3 (both exits)
-Gnarly
-Awesome
-Groovy
-Outrageous
-Funky
Total of 50 exits!