Use the arrow keys or WASD keys to move. Press the 0 key to edit the level. While in editor mode, you can change the spawn point, reset the level(with r) or go to a different level(with l). Level 100 is incomplete SMB 1-1 (not very detailed,not the full level and with no enemies). Note on enemies: almost there! Once i get to part 9, i can add enemies in the level editor.
Thanks to griffpatch for his amazing mario tile scrolling platformer tutorial. While building mario part 5, i got stuck and had to clone GMaxWildfire's.