Air 2 is a Super Mario Bros. ROM hack created by U1 in 2003, and is the second of the Air series. In the series, Mario must save the angelic damsel who went to "-Air-".
Besides all hidden blocks being marked, Air 2 is much harder than the first Air because it removes the infinite jump cheat from the prequel, with the level design being changed in a few places to account for the former. Emulator tools and glitches are required to complete the trial-and-error platform puzzle hack.
While no longer publication-worthy because the original Air 2 publication was intended to be a showcase, my TAS beats periwinkle's "rough draft" by 50 frames.
Take your swing, the IPS patch to download awaits you.
I overlooked an improvement in Air 4-2, sorry!