Click and Drag to Draw. Select the colors from the left hand palette.
[F] Fill under the mouse cursor.
[SPACE] Cycle zoom levels (x2, x4, and back to x1)
[ARROW KEYS] Pan around when zoomed
[U] Undo last move (step back)
[R] Redo last move (step forward)
[L] Load - See slot 1 & 2 :)