"Dragon Warrior Monsters", the first game in the series, was released in 1998 in Japan and in North America and the PAL region the next year for the Game Boy Color. The Japanese version was called "Dragon Quest Monsters". It was released with Game Boy Color compatibility despite coming to market before the console itself, but the cartridge was backward-compatible with the original Game Boy as well. Its sequel, "Dragon Warrior Monsters 2" was also a cross-system Game Boy Color title. It released in Japan and North America in 2001. There are two versions of the game: "Cobi's Journey" and "Tara's Adventure", titled after the playable character of each version. In Japan, these were named "Ruka’s Journey" and "Iru's Adventure", respectively. Each version features slight differences, such as monster appearances. Both games were developed by TOSE and published by Enix. "Dragon Quest Monsters 1+2", a remake of these two games with updated graphics and an interface, was released in 2002 in Japan, for the PlayStation. The game is compatible with the i-Mode adapter for the PlayStation, allowing players to upload monsters to the i-Mode cellular phone version, "Dragon Quest Monsters i". The two games were remade on the Japanese Nintendo 3DS on 2012 and 2014, respectively. The first remade game was ported to smartphones in 2018 for Japanese market.