Unlockable: Luigi Get 30 stars to unlock Luigi to play at certain levels. You can talk to Luigi at the beginning of a level in this test. Beat the level and you'll unlock a test of time "ghost." If you win the game, a door will open forehead spaceship Mario, just below the main platform. Enter the door to turn to Luigi and play any level as the bumbling brother. Unlockable: Staff Ghosts Be... more.