Pro Pool is a pool game released in the USA for the Game Boy Color, featuring English, French, and German language support. It is likely a simplified version of pool, adapting the gameplay to the handheld's controls.  Specific details on the gameplay features (number of players, game modes etc.) would require further investigation. The developer and publisher are unknown from the information provided.

Pro Pool (USA) (En,Fr,De)

Pro Mahjong Kiwame GB II (Japan)