Metroid is a Japanese action-adventure game franchise created by Nintendo. The player controls bounty hunter Samus Aran, who protects the galaxy from Space Pirates and other malevolent forces and their attempts to harness the power of the parasitic Metroid creatures. 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.