Arle's Adventure: Magical Jewels

Arle's Adventure: Magical Jewels (アルルの冒険 まほうのジュエル, Arle no Bouken: Mahou no Jewel) is a monster-training RPG for the Game Boy Color.

Gameplay
Arle's Adventure: Magical Jewels is a monster training RPG. As Arle Nadja, the player collects several Puyo cards. Each Puyo card contains a monster that can be summoned into battle and enhanced by way of stat-raising gems.

In battle, Arle summons up to two monsters from her six-card hand to assist her. Random battles, which consist of Arle's team versus two card monsters and a familiar Madou Monogatari opponent, can be won by simply defeating the leader character; however, defeating the entire team yields an EXP bonus. The player's characters have their HP automatically restored after battle, but any completely-incapacitated monsters remain unavailable until the player visits a card station.

Characters
Note that this page currently only lists returning characters.

Playable

 * Arle Nadja and Carbuncle

Random Encounters

 * Barbegazi
 * Black Kikimora
 * Cait Sith
 * Choppun
 * Demon Servant
 * Dullahan
 * Gust
 * Honey Bee
 * Lycanthrope
 * Mad Ape
 * Merrow
 * Mokujin
 * Mummy
 * Nasu Grave
 * Otohime
 * Panotty
 * Siren
 * Skeleton-T
 * Teppouuo
 * Vampire
 * Water Element
 * Will o Wisp
 * Wraith
 * Zombie

Bosses/Mini-Bosses

 * Zoh Daimaoh
 * Kodomo Dragon
 * Owlbear
 * Schezo Wegey
 * Suketoudara

Other

 * Rulue
 * Minotauros

Trivia

 * The game's producer, on their (now offline) personal blog, shared details on the game's development and how it initially would have tied into Pocket Puyo Puyo~n and the Shin Madou Monogatari timeline:
 * "The Day the Puyo Disappeared", the only "unreleased" work present in the Puyo Puyo end of the timeline, refers to the original setting of Arle's Adventure: Magical Jewels.
 * Several beings would have been aware of the lack of passage of time, including Schezo Wegey.
 * A sub-plot would have been initiated in this game, stemming from a line in which Arle tells Septem that she cannot "play forever". This would have convinced Satan to take action to end the time loop, leading Satan to kidnap Carbuncle for his powers in Pocket Puyo Puyo~n and culminating in the plot of Puyo Puyo Gaiden: Puyo Wars.
 * Wenellis and Saturni, characters exclusive to this game, would have been playable in Pocket Puyo Puyo~n.