Use

• ((User:UBX/9-ball))

or

• ((User:UBX/9-ball|n))

where n is a skill level:

1. a little, for fun
2. fairly often and fairly well
3. often and well
4. regularly and seriously
5. competitively and near-daily

e.g. ((User:UBX/9-ball|3)):

This user plays nine-ball, often and well.