Shadowman

Play As Deadwing:
Go into the playhouse and get to a room where you see a Cyclops playing pool. Kill it, then jump on the pool table. The "Cheat Active" message will then appear. Next look in the inventory to find the "Book of Shadows", open the book and "Book of Cheats" will appear at the top. Highlight the "Play as Deadwing" option and press Right. You will now play as Deadwing.