This is World 2 of Super Pieq Bros. with a funny boss defeated sound. In this game, you go through a series of screens to get to Bob and defeat him. There are 8 screens, making it a fairly long game (for Scratch). You can jump on Goombas to kill them, but if you get hit from the sides you die. You can't kill Piranha Plants, and there's only one special way to defeat Bob (people who played the original SMB1 should know it). Credit to S65