Enter one of the following codes at the title screen to activate the corresponding cheat function.

Effect	Code
Invincibility	[Up] [Down] [Up] [Down] [Left] [Left] [Right] [Right]
Secret chiptune	[Left] [Right] [Left] [Right] [Left] [Right] [Left] [Right]
Show frame rate	[Down] [Down] [Down] [Down] [Left] [Left] [Left] [Left] [Right] [Right] [Right] [Right]
Level select	[Up] [Up] [Up] [Up] [Down] [Down] [Down] [Left] [Right]