Genesis metasprite utility.

Given a PNG frame, properly paletted, this util lets you place Genesis sprites on top, building a metasprite. There are algorithms, but at this kind of task humans tend to do better.

Arrow keys change the current tool.

To move a sprite, use the move tool, or select a sprite from the list. To delete a sprite, click outside the image borders when moving.

When all non-background pixels are covered, the grey background turns green.