Newer Super Mario Bros. DS is a hack of New Super Mario Bros. that adds entirely new levels and custom enemies, bosses, music and graphics to the DS game. The hack also modifies the Blue Shell of the original game into the Hammer Suit from Super Mario Bros. 3.
While this TAS by Glitchman24 appears to be slower than previous TAS, it is in reality an improvement of several seconds, mainly thanks to using v1.05 (which changed the way the final boss fight works) and newly found tricks along with better optimisation.