-----------------THIS IS A WORK IN PROGRESS------------ Arrow keys to move and space to use a hammer. You can jump on goombas and use the hammer to destroy them. Touch Luigi and talk to him to be Luigi. Touch Mario and talk to him to be Mario. Touch Toad and talk to him to be Toad. Toad does not have a hammer but he has a faster speed and lower jump.
I added that you can defeat goombas and different-sized goombas and Luigi and Toad and shy guys. Thanks to @Misterythefox13 and @TheCrazyMurrayShow for the paper Luigi sprites and shy guy sprites and the hammer sprite edited by me @SpritersResource for the toad sprites except for the jmup one, I made that one