Rules

301 · 501 · 701 · 901

501 (with its shorter 301 and longer 701 and 901 variants) is the classic darts game: everyone starts on the same score and races to reach exactly 0.

Players take turns throwing up to 3 darts; the total is subtracted from their remaining score.
The first player to bring their score to exactly 0 wins.
A turn that takes the score below 0 (or to 1 with Double or Master Out) is a bust: the score returns to what it was before the turn.
Straight Out: any dart that brings the score to exactly 0 finishes the game.
Double Out: the dart that finishes the game must be a double (or the bullseye).
Master Out: the finishing dart may be a double or a treble (or the bullseye).
With Double In on, a player must hit a double before any points count; darts thrown before that opening double score nothing.
Single: the number itself. Double: ×2. Treble: ×3. Outer bull 25, bullseye 50.

The classic game of closing targets and scoring points — the most played darts game after x01.

Targets: 15, 16, 17, 18, 19, 20 and the bull.
Closing a target takes 3 marks: a single counts 1, a double 2, a treble 3. On the bull the outer ring counts 1 and the bullseye 2.
Keep hitting a target you have closed and every extra mark scores its value (bull 25) until your opponents close it too.
Once every opponent has closed a target, it no longer scores for anyone.
The player who closes every target with the highest (or equal) score wins.
Cut-throat: extra marks give their points to every opponent who still has that target open, instead of to you. Close every target with the lowest (or equal) score to win.
No Score (Points off): no points at all — the first player to close every target wins.

Cricket's bigger cousin: more numbers to close, plus any double and any treble as targets of their own.

Targets: the numbers 20 down to 12, Doubles, Trebles and the bull.
Closing a target takes 3 marks: a single counts 1, a double 2, a treble 3.
On the bull the outer ring counts 1 mark and the bullseye 2 (there is no treble).
Doubles and Trebles take one mark per dart: a double (or treble) on any number counts. The bullseye counts as a double.
A dart counts only once. A double or treble on a number you still need marks that number; once you have closed it, the dart marks Doubles or Trebles instead.
Without Points: the first player to close every target wins.
With Points: extra marks on a target you have closed score, as in Cricket, while an opponent still has it open — such a dart stays on its number. Doubles and Trebles score the dart's full value. Close everything while ahead to win.
Doubles & trebles can be switched off for the simpler game of 20 to 12 and the bull.

A practice favourite: race each other around the board, one number at a time.

Targets: 1, 2, 3 … up to 20, in order — optionally finishing on the bull.
Any hit on your current number moves you on by one: single, double and treble all count the same.
Several targets can fall in one turn (1, 2, 3 with three darts).
The first player to hit the last target wins.
Doubles or Trebles: only that ring counts — D1, D2 … D20 (or T1 … T20). The bull has no treble, so both finish on the bullseye.
Doubles & trebles skip (with any ring): a double moves you on two targets and a treble three — but never past the bull.

The simplest scoring game: no checkout to worry about, just score as much as you can.

Every player throws the same number of rounds of 3 darts — 8 as standard, or 10, 15 or 20.
Every dart adds its full value to your total — there are no busts and no targets.
After the last round, the highest total wins; a shared top total is a draw.