Programmer's Credit

This text is located at offset 0x6F in the game data: Copyright 1991 TENGEN LTD. Programmed by Jun Amanai.

Debug Mode

This text is located at offset 0xAEF6 in the game data, near the items on the options screen: DEBUG MODE The hidden Debug Mode menu item on the Options screen can be activated by putting 0xFF into memory location 0xD3F3.

Debug Mode has the following effects:

1. displays mapper/you step counts before every round (usually the step counts are displayed only after you've beaten a round)

2. allows you to access rounds 1-100 from the beginning (usually the rounds are gradually unlocked through play)

Secret Extra Round

The Japanese Manual for the game seeds the rumour that there are in fact 101 rounds not 100. Whilst not cut from the game the reference was cut from the USA English manual.

Secret Round 0 is only accessible if you finish each round "perfectly" which means equalling or beating the "mapper" step count for every round. The hint for this round is a message from the programmer.

Unused Sprites

The player sprite can kick, punch and head-butt to break blocks below, beside and above them. There are messages in the tile data for HEAD-BUTT and KICK, but they are unused in the game.

Also in the tile data are two small versions of the player sprite with fists, and an extra emoji-style characters: a smiley face. These are all at the size used for display in text or on the mini map level selection screen.

Sound Test Mode

On the Options menu, press 1+START to get to the sound test.

Alternative Credits

There is an alternative set of credits located at offset 0xB069 in the game data. This credits screen is shown on the second page of the Japanese manual with the caption "Credit screen occasionally appearing". The alternative credits sometimes appear before the Main Menu appears.

There is an alternative set of credits located at offset 0xB069 in the game data. This credits screen is shown on the second page of the Japanese manual with the caption "Credit screen occasionally appearing". The alternative credits sometimes appear before the main menu appears.

The code that governs the appearance of these credits asks for the following conditions to be satisfied:

1. Region of Game Gear hardware is Japan

2. We are about to see the Main Menu

3. The number of times the Main Menu has been viewed is a multiple of 8

The credits will not trigger if any of these conditions are false. For example, if you are using an "Export" (non-Japanese) Game Gear the alternative credits will not appear.

The fastest way to see them is to go in and out of the options screen 7 times. Alternatively, put your emulator in fast forward and watch the attract mode for 8 cycles.

disassembly 

F_CHECK_ALT_CREDITS:	
01CBB: ld hl, VAR_COUNT_OPTIONS_SCREEN_VIEWS	; VAR_COUNT_OPTIONS_SCREEN_VIEWS = $C338
01CBE: inc (hl)
01CBF: in a, (Port_StartButtonAndRegion)
01CC1: and $40
01CC3: jr nz, +
01CC5: ld a, (hl)
01CB6: and $07
01CB8: jr z, F_SET_STATE_ALT_CREDITS
...
F_SET_STATE_ALT_CREDITS:	
01D36: ld a, $0B
01D38: jp F_SET_STATE_MACHINE

Hints

Hints are different in Japanese and English. English uses tiles in place of words to help with the limited room to spell things out.

Cut Rounds

The Japanese Manual for the game contains screenshots of 10 levels that didn't quite make it to the final game for various reasons, as detailed in the Japanese text. They can be entered into the game in MAP EDIT mode so you can actually play them. These extra rounds were cut from the US English manual.


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