Hunt down your opponent's ships before they get yours. Currently, two players are required to play. A single player version which does not require you to sign in is coming soon. Note, both players currently need to sign in using their Google Play Games profile in order to enable real-time multiplayer game play. Experience this classic pre-World War I pencil and paper game in virtual reality. Play with or without a Cardboard viewer. A Cardboard viewer is recommended when playing on phones. Tablet players will likely prefer playing full screen in “magic window” virtual reality mode. Your feedback is greatly appreciated. Please tell me (firstname.lastname@example.org) what you like and don't like about the game, so I can make it better. Finally, this app asks permission to “access your photos, media and files on your device”. It does this in order to determine which Cardboard viewer your device is configured to use and in order to render the correct stereo image for your viewer. This viewer profile is stored in a file (/sdcard/Cardboard/current_device_params) on your device's internal SD card. This app permission is required in order to access this file. Scanning a viewer's barcode from the settings menu updates the contents of this file with that viewer's specifications.