From Wikipedia:
Torneko: The Last Hope, known as Dragon Quest Characters: Torneko no Daibōken 2 - Fushigi no Dungeon (ドラゴンクエスト・キャラクターズ トルネコの大冒険2 ～不思議のダンジョン～, "Dragon Quest Characters: Torneko's Great Adventure 2 - Fushigi no Dungeon") in Japan, is a console role-playing game for the Sony PlayStation. The game was co-developed by Chunsoft and Matrix Software and published by Enix in both Japan and North America in 1999 and 2000 respectively.
Torneko: The Last Hope is a spin-off title of the Dragon Quest franchise and the second Mystery Dungeon game to star the Dragon Quest IV character Torneko. It is also the second game in the Mystery Dungeon series to be released in North America, after Chocobo's Dungeon 2. Like in Torneko no Daibōken: Fushigi no Dungeon, Torneko (or Taloon, as he was known in Dragon Warrior IV) explores dungeons in search of items, while fighting of hordes of monsters.
In Japan, the game was ported to the Game Boy Advance in 2001, renamed Dragon Quest Characters: Torneko no Daibouken 2 Advance.
The main gameplay involves Torneko exploring maze-like dungeons in search of items. Each dungeon is full of monsters from the Dragon Quest games that Torneko can fight. The monsters can only make one move for each of Torneko's moves.