* Mirror Play : This code must be entered on the title screen, after inserting your money, but before pressing 1P START. Use the 2P bottom-LEFT key to input the following morse code sequence ('SHORT' = quick press-and-release, 'LONG' = hold the key for half a second) : LONG(x2), SHORT(x3), LONG, SHORST, press 1P START. You are now playing in Mirror Mode.

* Play Hidden Expert Courses : This code must be entered on the Mode Select screen. Move the cursor to Expert. Press and HOLD the 1P START button, and rotate the 1P turntable clockwise two full revolutions. Release 1P START, and rotate the 1P turntable clockwise one full revolution, making sure to stop the cursor on Expert. Press any 1P keyboard key to select Expert mode, and you can select new Expert Courses : Slake Mix, Nagureo Mix, and Another Mix (Note : Another Mix may not be played in Battle Mode).

* Play Hidden Song LINN 1999 : This code must be entered on the title screen, after inserting your money, but before pressing START. Use the 2P top-left key to enter the following morse code sequence. 'SHORT' is a quick press-and-release of the key, while 'LONG' means you have to hold the key for at least half a second : SHORT, LONG, SHORT(x4), LONG, SHORT, LONG, SHORT, press START. On Normal or Hard mode, choose 'Random Song' on your final stage. The song you play will be the hidden song, LINN 1999. Good luck!

* Random Play : This code must be entered on the title screen, after inserting your money, but before pressing 1P START. Use the 2P bottom-right key to input the following morse code sequence (SHORT = quick press-and-release, LONG = hold the key for half a second) : SHORT, LONG, SHORT(x2), LONG(x2), SHORT, press 1P START. You are now playing in Random Mode.

* All Music Mode : This code must be entered on the title screen, after inserting your money, but before pressing START. Slowly rotate the 1P turntable one full revolution clockwise. As you rotate it, input the following keyboard sequence :
1P bottom right
1P top right(x2)
1P bottom center(x2)
1P top left
1P bottom left
1P bottom center(x2)
2P top right
2P bottom center
1P bottom left
Press 1P or 2P START. Now when you select Normal or Hard mode, all of the music on the machine is immediately available for play, including all the hidden/expert songs.