Unlockable items:
Unlock the following items by collecting the items in the crates of the corresponding levels, and then completing the levels:
ITEM – LEVEL
Alien Hat – Level 2-1
Astronaut Hat – Level 1-1
Babe Speech-Bank – Level 4-3
Bolt Flag – Level 6-4
Captain Speech-Bank – Level 2-3
Column Gravestone – Level 6-5
Creepy Speech-Bank – Level 1-3
Cross Gravestone – Level 6-2
Crush Flag – Level 4-4
Digital Gravestone – Level 4-2
Doctor Speech-Bank – Level 3-3
Eyeball Hat – Level 1-5
Female Computer Speech-Bank – Level 5-3
Helmet Hat – Level 3-1
Insignia Flag – Level 1-4
Logical Speech-Bank – Level 2-5
Meteor Flag – Level 3-4
Obelisk Gravestone – Level 3-2
Padded Hat – Level 4-1
Petrified Gravestone – Level 4-5
Post Gravestone – Level 2-2
Princess Speech-Bank – Level 6-3
R.I.P. Gravestone – Level 1-2
Red Hat – Level 5-1
Slab Gravestone – Level 5-2
Strong Worm Flag – Level 2-4
Tentacle Flag – Level 5-4
Visor Hat – Level 5-6
Yellow Hat – Level 6-1
Zap Flag – Level 3-5?