Arrow keys to move, Run - D, Jump - F (In editor you move using all arrow keys) Press space in editor mode and a menu will show up. Click to select a tile, and then u can place it. To play, press the triangle in the top left corner. To stop it, press it again. Press E for eraser. This is an alpha, this is why there are so few blocks. Also coins are solid right now.
Play here: https://turbowarp.org/858441160/fullscreen?offscreen Nintendo for sprites and music. Engine is made by me, no griffpatch! Thanks to Dan Salvato (yes, that one) who made the SMB collision detection flowchart, which was useful for this. Thanks to OneLoneCoder for a bug fix that i couldn't figure out myself. v0.1b: Added screen borders, made the camera not go lower than x0 y0, improved jumping physics. v0.2: Changed look to SMW, improved physics, added fast running, added block select menu, added parallax background, changed tile size to 24 v0.2b: Added create/play system, added new blocks.