Enter one of the following codes using the "Code Entry" option at the "Extras" menu.

Effect	Code
Additional Pea Shooters	691472
All character's third costumes	431154
Concept Art Pack 1	444436
Concept Art Pack 2	534774
Concept Art Pack 3	141814
Concept Art Pack 4	938158
Concept Art Pack 5	832681
Maisy character and Insane difficulty	837367
Maisy's second costume	134787
Max's second costume	112969
Rivet's second costume	941233
Song Pack 1	426883
Song Pack 2	158833
Song Pack 3	164296
Song Pack 4	632567
Song Pack 5	874654