To make all characters that you are with recover 10 HP, meet the Druid and do a quest for her; she will then teach Lucy Healing Waters. When Lucy is chosen, go to the Pan Pipes screen and draw a V on the Coridal Touchscreen.
To make a Red Dwarf appear and help you fight for 15 seconds, meet the Dwarf and do one of his quests; he will then teach you Lucy Dwarf Digger. When Lucy is chosen, go to the Pan Pipes screen and play (1-2-3).
Activate the following cheats by pressing the corresponding sequences of buttons during gameplay:
CHEAT EFFECT - CHEAT Full health - LEFT, RIGHT, UP, DOWN, A(4). Stronger attacks - A, UP, B, DOWN, X(2), Y(2). Extra money - UP, X, UP, X, DOWN, B, DOWN, B. All Blessings - LEFT, UP, A, B, RIGHT, DOWN, X, Y. Max out skills - A, LEFT, RIGHT, B, DOWN, UP, X(2). Max out attributes - LEFT, B, UP, Y, DOWN, X, RIGHT, A. All costumes - A, X, Y, B, UP(3), DOWN.
Originally, the two 'blocked' cave entrances on Red Dwarf's Peak were bonus dungeons that could be unlocked in multi-player mode. Although they were to be used, they later were blocked off permanently. They cannot be accessed at all on the retail build.