Your targets are the important doubles to master.
Throw one dart on each double and track your hits.
If you manage to hit all three doubles you get one extra turn.
Doubles are:
16-8-4
20-10-5
12-6-3
8-4-2
1 hit = 1 point
2 hits = 3 points
3 hits = 5 points + repeat of turn.
