• ✓Idea (from the tile worksheets): halves that meet must match in shape AND colour
• ✓Generated edge-first, then the tiles are read off the edges — so a solution always exists
• ✓The halves around the outside are printed as the opening clues
• ✓Judged by the RULE, not an answer sheet — any arrangement where every join matches is right
• ✓Tap a laid tile to pick it back up — no dead end you can't undo
• ✓Drag to place, or tap a tile then tap a cell
• ✓Every motif has its own silhouette (semicircle, bar, triangle, trapezoid, zigzag, ring) — never colour alone
• ✓Ramps 2×2 → 3×3 while narrowing the shape and colour pools, so later boards really do ask more
• ✓A hint (glows an empty cell + bounces the tile that answers it) and a breathing pause after a run of misses
• ✓Add a rotate-the-tile mode and a 4×4 gridplanned

✓ = done · ☐ = planned. Every game is built one step at a time like this.