Glaze

A minimalist color-stacking puzzle. Fill each board with tetromino pieces so it matches the goal picture. Yellow and red are transparent pieces, lay a yellow over a red and the cell reads orange. But an orange cell in the goal might be an orange piece or a red glazed by yellow, and you can't tell which just by looking. Figuring out which is the whole puzzle. How to play Tap a piece, then tap the board to place it (its center lands where you tap). Rotate with R, undo with U. Tap a placed piece to pick it back up. Stuck? You get 3 hints per level. 20 hand-tuned levels that build from simple fills to tightly-packed boards. Made in a single HTML file. Runs in your browser, no install.