Super Mario Bros. 3 +

A ROM hack of Super Mario Bros. 3 by infidelity that hopes to combines a lot of the best elements of the Mario franchise, even some of the modern entries. New features Include:

Press Start at the world map to choose between Mario, Luigi, Toad or Peach.
The player can save the game on the save menu, even at world 9.
Can re-enter and exit cleared stages.
Swapping characters retains obtained power ups.
Luigi can jump higher, Toad in big form can kick enemies/blocks, Peach has SMB2 floating mechanic.
Ground pound is possible by pressing down in mid air (it can also be disabled on the pause menu), it used on a slope you gain speed.
Wall jump.
Can toss objects vertically or drop them.
Can jump off vines.
Hammer suit new ability: duck and press B to charge, release B while holding down to dash forward doing damage.
Secret feature after completing the game!