There are six hidden characters that can be unlocked to be used in challenge mode and against another player. What you need to do is highlight a certain character and press the C/3 button three times within a second. It isn't as bad as you think though, since you can choose which second in the countdown to press the C/3 button three times. 20 - Judgment 19 - Sun 17 - Star 15 - Devil 13 - Death 11 - Justice 8 - Strength 7 - Chariot 6 - Lovers 5 - Hierophant 4 - Emperor 3 - Empress 2 - High Priestess 1 - Magician 0 - Fool If done correctly you will see the hidden characters appear about a second later. The characters unlocked this way are: Moon, Hanged Man, Hermit, Temperance, Tower, and Fortune. You will also gain 10 seconds to the countdown, which can go up to the max of 20.