Up and Down arrows: Navigates through the elements. On Android, swipe left and right.
Tab and Shift+Tab: Moves through available game tab, player, computer, default. This change will switch cards navigated with navigation keys, for example, your cards will be shown in player tab. On Android, swipe left and right with 2 fingers.
Enter: Performs the selected operation, eg new game button. On Android, double tap with 1 finger.
Escape: Exit the game. On Android, click back button.