An authentication method and system includes a computing device, such as a smart phone, which includes a display for presenting a graphical and interactive game board that is used for entering a user's passcode. During the authentication process, the user selects a game board (e.g. chess, checkers, poker, backgammon, etc.) and associated game pieces for presentation on the display. The user then moves one or more game pieces to locations on the game board. Together, the selected game board, selected game pieces, and the movements and/or locations which the game pieces are moved on the game board form an entered passcode. This generated passcode is then compared with a stored passcode to authenticate the user before granting access to the computing device.