It's Mr. Pants Codes -

Art Gallery pictures:
Complete five puzzles in puzzle mode to unlock one picture in the Art Gallery. Note: Other difficulty settings will unlock other pictures. More pictures are unlocked at various progress points in Wipeout and Marathon modes.

Bronze Marathon trophy:
Survive five minutes in Marathon mode under the easy difficulty setting.

Bronze Puzzle trophy:
Successfully complete Puzzle mode under the easy difficulty setting.

Bronze Wipeout trophy:
Clear all blocks in Wipeout mode under the easy difficulty setting.

Gold Marathon trophy:
Survive five minutes in Marathon mode under the hard difficulty setting, after getting Silver.

Gold Puzzle trophy:
Successfully complete Puzzle mode under the hard difficulty setting, after getting Silver.

Gold Wipeout trophy:
Clear all blocks in Wipeout mode, under the hard difficulty setting, after getting Silver.

Hard Marathon mode:
Survive five minutes in Marathon mode under the medium difficulty setting.

Hard Puzzle mode:
Successfully complete Puzzle mode under the medium difficulty setting.

Hard Wipeout mode:
Clear all blocks in Wipeout mode under the medium difficulty setting.

Silver Marathon trophy:
Survive 5 minutes in Medium Marathon (After getting Bronze)

Silver Puzzle trophy:
Successfully complete Puzzle mode under the medium difficulty setting, after getting Bronze.

Silver Wipeout trophy:
Clear all blocks in Wipeout mode under the medium difficulty setting, after getting Bronze.

Special Marathon mode:
Successfully complete Marathon mode under the hard difficulty setting.

Special Marathon trophy:
Successfully complete Marathon mode under the special difficulty setting, after getting Gold.

Special Puzzle mode:
Successfully complete Puzzle mode under the hard difficulty setting.

Special Puzzle trophy:
Successfully complete Puzzle mode under the special difficulty setting, after getting Gold.

Special Wipeout mode:
Successfully complete Wipeout mode under the hard difficulty setting.

Special Wipeout trophy:
Successfully complete Wipeout mode under the special difficulty setting, after getting Gold.