Complete the game and then select the 'Challenge Mode' option and start at the beginning to play with your previously unlocked costumes and weapons. During the intermission sequences your original costume will still appear.
Unlock Brutal DifficultyAdded 25 Aug 2009, ID #4886
This mode is similar to Hard mode except the game will not show you the colours of their attacks which means you have to memorize each enemies moves to successfully judge if it is a dodge or a block. This feature becomes an available option when you have completed Story mode in any difficulty setting.