 Though the wise man rewards often consist of self-evident "advice", most come in the form of "Zenny coins", currency that allows the player to buy various items, such as an upgrade to their weapons and armour, keys for treasure chests, and anti-poisoning potions.Hidden special items that reveal coins, grant upgraded armour, full vitality, extra lives, extra time, or simply bonus points may be found by attacking certain walls.The player's vitality bar will also increase up to four times as a reward for reaching score benchmarks.