Japan cannot cut back on mahjong!
The title roughly translates to Professional Mahjong Warriors.
Development Related text#
The internal codename for the game can be found at 0x42CC.
PRO MJN TUWAMONOJoryuu Janshi ni Chousen GB#
Joryuu Janshi ni Chousen GB: Watashitachi ni Chousen Shitene is a direct rebranding hack of Pro Mahjong Tsuwamono featuring slight gameplay changes, a few minor palette tweaks, and altered graphics for the title screen and Super Game Boy borders.
(Source: nensondubois)