The Dart Board is a training item that is used to increase the players aim score (use to improve skill). It can be found in Lancaster Lane and the Riverside Estate. Using it in an evenings training session costs 50 experience points and 10 additional point per use after the first. Training with it increases the players aim score by one point.
As of version 0.101 the darts dull after one evening of use. (This change may have happened in an earlier update.)