Note: This game is also known as - Marbles! Balance Challenge

At the "Options" menu at Anthony's house, select the "???" option. Select the lights in the correct order, then enter the symbolic code:

Mirror mode - [Right Arrow] [Left Arrow] [Left Arrow] [Right Arrow], then Ladybug, Clover, Boy Face, Plane, Bus, Bike. While selecting a stage in Free mode, press 2 to play its mirrored version.

Master Higgins Ball - [Right Arrow] [Left Arrow] [Left Arrow] [Right Arrow], then Square Robot Face, Car, Award Ribbon, Bike, Helicopter, Strawberry.

Bonus characters - Successfully complete the indicated task to unlock the corresponding character:

Bomberman: Get forty Platinum trophies in Hard mode.
Easter: Get thirty five Gold trophies in Hard mode.
Martian: Get twenty five Gold trophies in Hard mode.
Master: Successfully complete Hard mode.
Monster: Get thirty Gold trophies in Hard mode.
Paper Bag: Get fifteen Gold trophies in Hard mode.
Pumpkin: Get ten Gold trophies in Hard mode.
Snowman: Get five Gold trophies in Hard mode.
Space Suit: Get twenty Gold trophies in Hard mode.

Bonus marbles - Successfully complete the indicated task to unlock the corresponding marble:

Anglerfish: Successfully complete Challenge Stage 11 in the Sunken Depths in Normal mode.
Baseball: Get thirty Gold trophies in Easy mode.
Bomb: Get twenty Gold trophies in Normal mode.
Broken Television: Get thirty five Gold trophies in Normal mode.
Dog: Get one Gold trophy in Easy mode.
Earth: Successfully complete Challenge Stage 11 in the Space Station in Normal mode.
Egg: Get sixteen Gold trophies in Normal mode.
Figure Roller: Successfully complete Stage 10 in the Stump Temple in Normal mode.
Football: Get twenty Gold trophies in Easy mode.
Frog: Get eight Gold trophies in Normal mode.
Goldfish Bowl: Get twelve Gold trophies in Normal mode.
Hedgehog: Get forty Gold trophies in Normal mode.
Panda: Take more than three minutes time to complete Stage 1-1.
Penguin: Get five Gold trophies in Normal mode.
Pig: Get three Gold trophies in Normal mode.
Saturn: Get thirty Gold trophies in Normal mode.
UFO: Get twenty five Gold trophies in Normal mode.

Hard mode - Successfully complete the game on the Normal difficulty to unlock the Hard difficulty.