Metal Masters is a Game Boy strategy game released in the USA. It likely involves strategic gameplay, possibly turn-based combat, and the management of resources.  The game would involve decisions and strategies on the player's side, making it a brain-challenging game.  This game is likely a simulation or strategy game, with the goal of winning a tournament against rival players. The appeal is likely the challenge of creating and managing a team.

Metal Masters (USA)

Meitantei Conan - Chika Yuuenchi Satsujin Jiken (Japan)