The dartboard is the world. Every number 1–20 is a territory, bordering the numbers either side of it.
The bull is the Citadel, which borders every number. Throw three darts a visit; where they land is what you do,
the ring is how hard: single ×1, double ×2, treble ×3.
- Your own territory: reinforce it, +1 / +2 / +3 troops.
- An enemy or neutral territory next to yours: attack it from your strongest neighbour of it (that needs 2+ troops).
It loses 2 / 4 / 6 troops. A single that doesn't take it costs you 1 troop.
- Take it to 0 and it's yours: half the attacking troops march in. You can keep going from there with your next dart.
- Too far away (no territory of yours next to it): the dart is wasted.
- The Citadel: 25 counts ×1, bull ×2. Hold it for +2 troops a turn, and to strike any number on the board.
Reinforcements arrive at the start of each of your turns and march to your most threatened borders by themselves:
1 per 3 territories (at least 3), +2 for each region you hold whole, +2 for the Citadel.
The five regions are the four-number arcs round the rim.
Winning: hold the target number of territories (14 of 21 with two players, 11 with three, 9 with four), or be the last house standing.
At the round limit the biggest empire wins (territories, then troops).
Openings: Dealt shares the numbers out at random with a couple of neutral ones. Claim by darts starts with an empty
board: hit a free number to claim it (×1/×2/×3 troops) until every number is taken (or 4 rounds pass).
The board: real darts come from the local camera board manager (corrections in it roll the game back).
No board? Flick darts on the screen: press on your target, pull back, let go. On a shared phone or tablet each visit waits behind a
“pass to” tap. Keys: M sound, H hints, I rules.