 The game also features various Bonus Challenges . When Cooper collects five Rare books ( there are 100 Rare books in total ) during his adventure in Ghoulhaven Hall , a Bonus Challenge is unlocked . The main objective of the Bonus challenges is to revisit one of the rooms and perform a different task within it , such as defeating a number of enemies in a certain amount or time or surviving a duel with the Grim Reaper . Upon completing a Bonus Challenge , the player is awarded with a bronze , silver , gold or platinum medal based on their performance . For every platinum medal earned , a piece of the game 's concept art is unlocked . If the player collects all 100 Rare books and earns all 20 platinum medals , the player is given the option to reset the game with Amber unlocked as the new playable character . 
