Pokémon HeartGold & SoulSilver are remakes of the original Gold & Silver games released in 1999 with further aspects which were introduced in Crystal in 2000. These games are set in the Johto & Kanto regions and were released in Japan in September 2009. As these games are remakes of Gold & Silver, they will feature both Johto & Kanto and follow the storyline of you as a new trainer, going through the gyms of Johto and Kanto, and winding up needing to thwart a Team Rocket plot to takeover the world with their Pokémon. You can save your data to your browser. Click the settings icon and press "Save State Location", then change it to "Keep in Browser". You can enter fullscreen by hovering over the game and pressing the fullscreen button in the bottom right If pressing enter causes the game to tab in and out, just click on the middle of the game to refocus.