The companion to the Red version, Pocket Gem Blue by Nanjing Technology offers a parallel adventure on the NES platform. Players explore a vast world of towns, forests, and caves, capturing unique creatures to build the ultimate team. The game features a traditional turn-based combat system with a focus on elemental weaknesses. For collectors of unlicensed retro games, this title represents the peak of 8-bit monster-taming RPGs produced outside of Japan.