One of my favorite tricks "back in the day" took advantage of Super Mario All-Stars SMB1's new "switch players' turns on level completion, not just life loss" feature.
I'd play a 2-player game by myself, taking Mario down the 3 and 8 warps, and Luigi down the 4 and 7 warps.
Along the way, in 3-1 and 7-1, I'd collect 128 lives from the shell-stairs trick. And, as long as both players died an equal amount of times (preferably zero =P), both players would arrive at world 8 on the same turn.
In effect, it was a cool and quick way for me to get a maxed-out 2-player save game. XD
I also enjoyed DeHackEd's "two games, one input" run of Mega Man X1 and X2 when he did it; especially the side-by-side AVI is fun to watch.
Also entertaining for me was the recent "SMB1 race" video where the two speedrunners showed off and beat the game at roughly the same time...
...You guessed it, folks. I just thought up a crazy combination of the above concepts. =P
Some as-fast-as-possible TAS's would be made of some different paths through the game. Preferably paths of equal or similar level amount, as I will now list from longest to shortest:
no warps: 11112222333344445555666677778888
only 2: 112222333344445555666677778888
only 5: 111122223333445555666677778888
2 and 5: 1122223333445555666677778888
only 3: 11333344445555666677778888
only 6: 11112222333344666677778888
3 and 5: 113333445555666677778888
2 and 6: 112222333344666677778888
only 4: 1144445555666677778888
only 7: 1111222233334477778888
4 and 5: 11445555666677778888
3 and 6: 11333344666677778888
2 and 7: 11222233334477778888
only 8: 111122223333448888
4 and 6: 1144666677778888
3 and 7: 1133334477778888
2 and 8: 1122223333448888
4 and 7: 114477778888
3 and 8: 113333448888
4 and 8: 11448888
I'm really hoping that there'll be two paths here that both can be finished on or near the same frame.
Reason being: when it comes time to encode the FCMs into AVI, there would be one AVI showing both of the paths being run side-by-side, like DeHackEd's X1/X2 movie or the SMB1 real-time race movie.
And for added "exciting race" effect,
this "Super Luigi Bros." ips patch that I made recently could be used. It switches around all instances of Mario and Luigi. So one half/path of the AVI could show Mario and the other half/path Luigi. :)
Thoughts?