Janou Touryuumon (Genesis)

Test Mode
Activate the patch-code 01E194:6032, then start the game and choose the leftmost menu. You will get to the Test Mode screen. You may also need code 00040A:6016 to avoid Red Screen of Death, likely due to an incorrect checksum issue.

At this screen you can see developers' photos, some endings and mahjong combinations. There is also sound and music tests there.