As in standard Cricket, Scram can use all the numbers on the board minus the bulls-eye, [4] [5] the numbers 15 through 20 and the bull’s-eye, [6] or random number selections. Like with most dart games, 3 darts are thrown each turn per player. If teams are used, turns alternate between opposing players, i.e. Team 1, Player 1 -> Team 2, Player 1 …
https://en.wikipedia.org/wiki/Cricket_(darts)