Cheat mode...
	Spread gun...

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]

In v1.1 or later play the first mission. Use the fence at the start to reach the watch post platform directly next to it. Once there, jump and shoot upward a few times. A hidden power-up for the Spread gun will drop.