Heavy Unit: Mega Drive Special/Hidden content

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"Charctor" and object test

On the title screen, press HOLD ++ START  to access the first of three graphics viewers. The first shows background graphics, the second sprite graphics, and the third a list of all the "objects" the game has defined.

Graphics can be changed by holding and pressing or . Holding instead changes attributes and holding changes the palette.  START  moves on to the next screen.

"Luna Sukikage" message

On the options screen, highlight "pass word" and press 100 times.

99 credits

Enter "TOMOYO" as a password.

Enable stage select

Enter "SOSITE" as a password. This will add a "stage" counter to the options menu.

Invincibility

Enter "OHNUKI" as a password. There are no indicators that the password has worked, but when starting a new game, nothing will hurt you on impact.

Record gameplay

Enter "RECORD" or "OGOSHI" as a password, then play the game normally. After a game over, return to the options menu and enter "REPLAY" as a password. Now when starting the game, you will be able to watch your previous attempt.

Enable X position counter

Enter "LOCATE" as a password, then start the game normally. The code adds a hexadecimal counter in the top right which increments as you move through the stage, likely for the purposes of debugging.

Invert colours

Enter "INVERT" as a password, then start the game normally. All the colours will be inverted.

Alternative palettes

The passwords "COLORB", "COLORC", "COLORD", "COLORE", and "COLORF" all change the in-game palettes, with "COLORA" returning to the default visuals. These codes can be used in conjunction with the invert code above for more combinations.