Use arrow keys to move. When you touch Bowser, press Z a bunch to gain speed. Press space when you are told to throw bowser. Press X to change map. Your min speed is how much speed you need to throw Bowser. Friction makes you lose speed while spinning and make bowser lose speed faster.
Nintendo for Super Mario Updates: Jan 25: V1 released ???: V2, added friction and minimum speed ???: V2.1, added ground types Feb 16: V2.2, added multiple maps Feb 22: V2.3, added nonworking bomb and variable show and hide toggle Feb 25: V3, made bombs functional