Enter the following codes at the 'Mode Selection' screen to unlock the corresponding effect.

Unlock 2X Speed:
Press Center, Center, Top Left, Center, Center, Center, Top Right, Center.

Unlock 4X Speed:
Press Center, Center, Bottom Right, Center, Center, Top Left, Center, Center.

Unlock 8X Speed:
Press Center, Center, Bottom Left, Center, Bottom Right, Center, Center, Center.

Unlock Crazy Mode:
Press Center, Bottom Left, Center, Bottom Right, Center, Bottom Left, Center, Bottom Right.

Unlock Sudden Mode:
Press Center, Center, Top Right, Top Left, Center, Bottom Left, Bottom Right, Center.

Unlock Random Mode:
Press Center, Bottom Left, Center, Bottom Right, Center, Top Right, Center, Top Left.

Unlock Vanish Mode:
Press Center, Center, Top Left, Top Right, Center, Bottom Right, Bottom Left, Center.

Unlock Mirror Mode:
Press Center, Center, Bottom Left, Center, Top Right, Bottom Right, Center, Top Left.

Unlock Sudden and Random Mode:
Press Top Left, Top Right, Center, Bottom Left, Bottom Right, Center, Top Left, Top Right.

Unlock Vanish and Random Mode:
Press Bottom Left, Top Left, Top Right, Bottom Right, Bottom Left, Top Left, Top Right, Bottom Right.

Unlock Union Mode:
In 2-Player mode press Bottom Left, Bottom Right, Center, Top Left, Bottom Right, Bottom Left, Center, Top Right.

Unlock Synchro Mode:
In 2-Player mode press Center, Center, Top Left, Top Right, Top Left, Top Right, Center, Center.

Unlock Anti-Synchro:
In 2-Player mode press Center, Center, Bottom Left, Bottom Right, Bottom Left, Bottom Right, Center, Center.

Unlock Remix Double Mode:
In Non-Stop Remix mode press Bottom Left, Top Left, Bottom Left, Center, Top Right, Bottom Right, Top Right, Center.

Unlock Remix Crazy Mode:
In Non-Stop Remix mode press Center, Bottom Left, Center, Bottom Right, Center, Bottom Left, Center, Bottom Right.

Disable ALL Active Codes:
Press Center, Center, Center, Center, Center, Center, Center, Center.

No Arrows:
Press Top Left, Top Right, Center, Top Left, Top Right, Center, Top Left, Top Right.