I Spy Challenger

Level select:
Press Start during game play, then select the "Code" option. Enter one of the following codes to advance to the corresponding level.

Level 2 (easy difficulty): Press Up(2), Left.
Level 2 (expert difficulty): Press Up(3).
Level 2 (hard difficulty): Press Up(2), Down.
Level 2 (medium difficulty): Press Up(2), Right.
Level 5 (easy difficulty): Press Down(2), Left.
Level 5 (expert difficulty): Press Down(2), Up.
Level 5 (hard difficulty): Press Down(3).
Level 5 (medium difficulty): Press Down(2), Right.
Level 10 (easy difficulty): Press Left(3).
Level 10 (expert difficulty): Press Left(2), Up.
Level 10 (hard difficulty): Press Left(2), Down.
Level 10 (medium difficulty): Press Left(2), Right.
Level 15 (easy difficulty): Press Right(2), Left.
Level 15 (expert difficulty): Press Right(2), Up.
Level 15 (hard difficulty): Press Right(2), Down.
Level 15 (medium difficulty): Press Right(3).
Level 20 (easy difficulty): Press Left, Right, Left.
Level 20 (expert difficulty): Press Down, Up, Down.
Level 20 (hard difficulty): Press Up, Down, Up.
Level 20 (medium difficulty): Press Right, Left, Right.