Pokémon Platinum features a new story full of adventure, never-before-seen forms of powerful Pokémon--including the legendary Giratina's Origin Forme--and the Distortion World, a mysterious new world that suddenly appears in the Sinnoh region. 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.