Interactive debug mode: Hold I while the game loads. Then, press Up,
Down, Left, Right, Up, Down,
Select, II at the title screen.
Omake mode: Hold I and press Run at the PC Engine
CD boot screen. Then, hold Right + Select at the
main menu and select the "Begin" (first) option.
Scenario select: Hold I and press Run at the PC Engine
CD boot screen. Then, hold the following buttons at the main menu
and select the "Begin" (first) option.
