Jack Bros.

Jack Bros. is the first-ever localized title from the Megami Tensei series, although with some changes (Jack the Ripper was renamed Jack Skelton, among other story changes). Unfortunately, it was on a doomed platform, which meant no more localizations...for a while.

Sound Test#

Japan	US (re-enabled)

In the Japanese version, a sound test can be accessed with the following button combination with the left D-Pad, on the title screen: Up, Up, Up, Down, Down, Down, Down.

Navigate the sound test with the left D-Pad by pressing Up to move forward or Down to move backward, and select the song with the A button and stop the song with the B button. Reset the system to exit the sound test.

It is dummied out in the US version, as the function associated at address 0x1218 doesn't detect the language byte at 0x0004 as 0x00 (Japanese mode). There are patches to re-enable it, albeit with untranslated entries.

Debug Mode#

While playing, pause the game and enter the following combinations with the D-Pad to enable/disable a Full Map View mode:

• Enable: Up, Left, Down, Right
• Disable: Up, Right, Down, Left

There are further debug options available, but the address 0x0000 has been set to 0x00, disabling the debugging features in all regions. It can be re-enabled with the debug patch below. Entering the following on the title screen with the left D-Pad will enable some of these features:

• Floor Select Menu - Level Select. Press Right, Right, Right, Right, Right, Right, Right, Left, Right, Right, Right, Right, Right, Right, Right to access.

• Muteki Select Menu - Set invincibility on (muteki) or off (ataru). Press Up, Right, Down, Left, Up, Right, Down, Left, Up, Right, Down, Left to access this menu.

• Coordinate Display - Press L+Select during gameplay to display the player's coordinates below the timer.

Download Jack Bros Debug Patch File: JackBros-Debug-Patch.zip (1KB) (info)

Regional Differences#

This needs some investigation. Discuss ideas and findings on the talk page. Specifically: There are probably more differences (story, text, ect.)

Several demons were renamed in the English version.

ジャックリパー

Jack Ripper

Jack Skelton

ネコマタ

Nekomata

Tomcat

リッチ

Lich

Mystic Morgan

イツァムナー

Itzamna

Skelipede

クーフーリン

Cu Chulainn

Furin

ロア

Loa

Sinister Scar

バックベアード

Backbeard

Spider Orb

ワイバーン

Wyvern

Wybern

ベルゼブブ

Beelzebub

Belzoff

Language Toggle#

Both releases of the game include an undocumented button code which switches the game to English. This essentially does nothing in the US version, but allows the Japanese game to be played entirely in English.

On the title screen, while highlighting either Start or Password, hold L + R + left D-Pad Left and press Start to select an option. Henceforth, the game will be in English.