I've got most of the main controls! Z for Mario, and X for Luigi, or press A to make them jump at the same time. Press C to switch to the jump option, and press V to switch to the hammer option. All we need to get to the real game is Room Laying, and the option to jump on to platforms. I will also change sound effects later.
Thanks to @SpideyPlaysMC for most code and sprites, the rest is by me. Logo design by me and @Matsnat64.
