Dragon Quest Monsters 2: Maruta's Mysterious Key – Iru's Adventure is a Japanese release for the Game Boy Color, continuing the monster-collecting adventure introduced in the previous installment. This game is part of a two-part series, each offering a different storyline and set of monsters. The gameplay focused on exploring, collecting, and battling with monsters.  Both titles in this dual-release were published by Enix.

Dragon Quest Monsters 2 - Maruta no Fushigi na Kagi - Iru no Bouken (Japan)

Dragon Quest Monsters - Terry no Wonderland (Japan)