On the opening screen you first pick a level — that's how many sets your game will have. You start with Level 1 unlocked, and completing a level unlocks the next. Then you choose those sets and the order to play them: tap sets in order (or use Pick random), then Start game. That order is fixed for the game. Each turn you throw 3 darts at the 3 target doubles shown, then tap the button matching how many you hit:
Each set starts on 5. Reach 15 to clear it — it turns green with a tick, and you move to the next set; drop to 0 and you lose the set, costing one of your three lives, and you retry that same set. Clear every set to complete the game; lose all three lives and it's game over. Restart game takes you back to set selection.
The bar on each double shows your hit rate for the current set, and stats appear at the end of a game. Undo fixes a mis-tap, and the sound toggle reads scores aloud.
Spotted a bug, want a new target set, or just fancy saying hello? Drop a note.
This ends the current game and starts it over.