Super Mario Bros. 2, but the sprites for players and some items are from the original Super Mario Bros. 1, featuring Toad's Mario Maker 2 sprites. The character select screen and ending scene also feature the player's color palettes. And any sprite that was new for SMB2 that wasn't originally in SMB1 removes the outlines.
this is a hack of the USA Super Mario Bros. 2, which gives the characters, mushrooms, and stars their sprites from the original Super Mario Bros. game. this hack was created by T-Bone.
Database match: Super Mario Bros. 2 (USA) (Rev 1)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: 67F68CABC5237A5892AFF746F5B784C62FCCDFAC
File CRC32: E0CA425C
ROM SHA-1: FF5BCACF7417B4DE1C49F9E54C2905D91391455B
ROM CRC32: CA594ACE