• ✓Idea: take the digits out of sudoku — the logic is untouched
• ✓Two dials: board size (by age) and number of clues
• ✓A clash lights the squares it conflicts with — the reason, not a red cross
• ✓Three worlds, three scenes — and no timer, ever
• ✓Sound, Beary, and a high-score kept
• ✓A finish screen that invites a bigger board
• ✓Fills the screen on phone & desktop

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