ROBOTRON 64

Enter the following while at the Setup Menu...

Up, Up, Down, Down, Left, Right, Left, Right, C-Left, C-Right, C-Left, C-Right............50 Lives

Up, Down, Right, C-Left, Down, Up, Left, C-Right, Up, Down.............Game Boy Mode

Down, Up, C-Left, Down, C-Left, C-Right, Down, C-Right...........Level Select