Load a profile, then press Right two times, Up, Down, 2, 1 two times, 2 at the chapter selection screen. When selecting a chapter that is past your current position you will get the move upgrades normally unlocked in the intermediate chapters. However, you will not receive any health upgrades.
Art galleries
Gallery
How to unlock
Gallery 1
Collect 20 grubs.
Gallery 2
Collect 60 grubs.
Gallery 3
Collect 140 grubs.
Gallery 4
Collect 210 grubs.
Gallery 5
Collect 350 grubs.
Concept art
Collect the grubs during game play to purchase the following concept art selections at the "Gallery" menu. Collect all 450 grubs to unlock all the artwork.
High-Res Creature Renders and Concept Art
Environment Concept Art 1
Environment Concept Art 2
Environment Concept Art 3 (Black and White)
Environment Concept Art 4
Box Art Concepts