This is a human theory TAS of SMB1. Though I do some things that are not humanly possible (very fast jumps in some places and the 8-3 FPG setup), it shows the lowest a human could theoretically get. The only thing that differs in this run than an RTA rules TAS is the 1st room of 8-4.
This is a TAS with some cool stuff I found out recently. Possible improvements are:
There is a load of click items in battle. If there's a way to avoid them, that would be amazing.
Also, I'm trying to find a pokémon swap that sets dex count to a value where no A-press is required to reach the credits.