Jack Bros.

The first ever localized title from the Megami Tensei series, although with the usual NoA censorship (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
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.

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

Debug Mode
Entering the following combinations with the D-pad on any retail version can enable a Full Map View mode, a map viewer:
 * Enable: Up, Left, Down, Right
 * Disable: Up, Right, Down, Left

The address 0x0000 has been set to 0x00, disabling the debugging features in all regions. It can be re-enabled with a patch, found here. Entering the following on the title screen with the left d-pad can enable some of these features:


 * Floor Select Menu: A Level Select. Enter Right, Right, Right, Right, Right, Right, Right, Left, Right, Right, Right, Right, Right, Right, Right.
 * Meteki Select Menu: Set invincibility on (muteki) or off (ataru): Enter Up, Right, Down, Left, Up, Right, Down, Left, Up, Right, Down, Left.