Retro Game Challenge

Powered-up Infinity Form:
Pause the game, then press Up, Up, A, B.

Hard Mode:
At the title screen, press Down, Down, B, B, A, A, Start.

Continue (with no score):
At the Game Over screen, press Left + Start.

Power-up:
Pause the game, then press Up, Up, A, A, B, B.

Haggle Man

Full health:
Pause the game, then press Down, Right, Up, Left, B, B, B, B, A, A, A, A.

Get Scrolls:
Pause the game, then press Up, Right, Down, Left, A, A, A, A, B, B, B, B.

Summon Allies:
Pause the game, then press Up, Right, Down, Left, A, A, A, A, B, B, B, B.

Secret Power-up:
Pause the game, then press Down, Right, Left, Up, B, B, B, B, A, A, A, A.

Unlimited Lives:
Hold Up/Left then press A + B on the screen before a level starts.

Continue:
At the Game Over screen, press Left + Start.

Haggle Man 2

Continue:
At the Game Over screen, press Left + Start.

Full Power:
Pause the game, then press Up, Down, Up, Down, B, B, A, A,

Get 3 Scrolls:
Pause the game, then press Down, Up, Down, Up, A, A, B, B.

Unlimited Time:
At the Stage Demo screen, press Left + Up + A + B.

Secret Power-up:
Pause the game, then press Up, Down, Up, Down, B, B, A, A.

Level Select:
At the title screen, hold A, then press Up, Up, Right, Right, Right, Down, Down, Left, Left, Left.

Haggle Man 3

99 Lives:
Pause the game, then press A, B, A, B, Left, Right, Left, Right.

9.999 Gears:
Pause the game, then press B, A, B, A, Right, Left, Right, Left.

Advance to Boss:
Pause the game, then press B, B, A, A, Left, Left, Right, Right.

Rally King

Invincibility:
At the title screen, press Up/Left + Select.

Eliminate Enemies:
At the title screen, press Down/Right + Select.

Skip to level 2:
At the title screen, press A, B, A, B, Up + Select.

Skip to level 3:
At the title screen, press A, B, A, B, Left + Select.

Skip to level 4:
At the title screen, press A, B, A, B, Down + Select.

Rally King SP

Invincibility:
At the title screen, press Up/Left + Select.

Eliminate Enemies:
At the title screen, press Down/Right + Select.

Skip to level 2:
At the title screen, press A, B, A, B, Up + Select.

Skip to level 3:
At the title screen, press A, B, A, B, Left + Select.

Skip to level 4:
At the title screen, press A, B, A, B, Down + Select.

Star Prince

Invincibility:
At the title screen, hold Up then press A, A, A, release Up and hold Down, then press B, B, B.

Continue:
At the Game Over screen, press Left + Start.