Click or drag to paint. Right-click paints air. The enemy brushes put a walker in that column; the eraser takes it out.
Background metatiles, 16x16 each, drawn with the current level's look. Click one to edit its pixels.
Sprite frames in CHR order. The engine finds each group by its first tile, so groups keep their sizes. Click a frame to edit its pixels.
A look is 32 colors: four background palettes (the first color is the sky, shared by all four) and four sprite palettes (their first color is see-through). Each level picks a look.
One song, looped everywhere. Each step is 8 frames (about 7.5 a second). The melody is a square wave; the bass is a triangle wave and holds each note for two steps. Click a cell to put a note there, click it again for a rest. Right-click clears.
Click or drag to draw with the chosen color. Right-click draws color 0.
Arrows move, Z jumps (A), X runs and throws (B), Enter is Start, Shift is Select. Click the screen for sound.