Pokémon Gold Version is an RPG developed by GAME FREAK and published by Nintendo for the Game Boy Color, first released in Japan in November 1999. The second-generation entry in the Pokémon series, it introduces 100 new Pokémon, bringing the total to 251. Players adventure through the all-new Johto region, catching and training Pokémon, challenging Gym Leaders, the Elite Four, and the Champion, with the ultimate goal of completing the Pokédex. The game adds a day-and-night system synced with real time, where different Pokémon appear at different times. Two new types, Steel and Dark, are also introduced to balance the type matchups. Pokémon genders and a breeding system make their debut, letting players hatch new Pokémon. The game supports trading with the previous Red and Green versions via the Time Capsule. In 2009, Nintendo released a Nintendo DS remake, Pokémon HeartGold, preserving the original's essence while adding new features and improvements.