Sonic Spinball (Sega Master System)

Free-Movement Mode
In the Options menu, play sounds 0, 9, 0, 1, 6, 8 in the Sound Test (the screen will shake if you did it right). Start the game, then pause and press 2.

Build Date
1994-05-30 P.M. FINAL REV. 22 (M) A build date is present at, and can be displayed in the Options menu by playing sounds 0, 5, 0, 3, 6, 0 in the Sound Test.