Tap the grid button between the achievements button and items button at the main menu to display the Bravest Warrior's computer. Enter the following codes at the computer to activate the corresponding cheat function.

Effect	Code
Catbug says "No biggie"	9000
Catbut says "Why would you do that?"	80085
Flappy Catbug	#0-0#
Newsboy Cap costume	55555555555
Shutter Shades costume	#--#
Toggle mirror mode	1337
Toggle upside down mode	3838