Power Grid

The board is split into four zones. Each has its own load meter, and your job is to bring at least three of them into balance without overloading any single one. Then ground the grid to cash in.

The four zones: North is 20, 1, 18, 4. East is 13, 6, 10, 15, 2. South is 17, 3, 19, 7, 16, 8. West is 11, 14, 9, 12, 5. Every number belongs to one zone, and each zone is a real run of neighbouring numbers on the board.

Loading a zone: hit any number in a zone and that zone's load moves. A single adds 25%, a treble adds 50%, and a double takes off 25% (and scores double, same as anywhere else). Load only ever sits at 0, 25, 50, 75 or 100%, nothing in between.

Blown fuse: push a zone to 100% or more and it blows. Your visit ends there, whatever you'd scored this visit is lost, the zone drops back to 0%, and you lose 100 points on top.

Grounding the grid: once at least 3 of your 4 zones sit at exactly 50% or 75%, a dart in the bull (either ring) grounds the grid. With fewer than 3 zones ready, a bull does nothing.

Grounding banks everything you've built up so far, multiplied by the number of zones that were ready: 3 times for the minimum, 4 times if you held out for every zone. You also get 500 points, plus 50 for each ready zone you built from 2 or more different numbers rather than one. All four zones then drop back to 0% and a new district begins.

The dart budget: you have a set number of darts for the whole session, not per district. Pick Short, Standard or Long before you start, and power as many districts as you can before they run out.