Cheat mode
Pause the game to display the "Fortress Of Solitude" menu. Then, enter one of the following codes at this menu to activate the corresponding cheat function. If you entered the code correctly, you will hear a sound. Note: Some codes cannot be enabled until the Warworld level (level 3) has been completed.

Play as Bizarro in Free Roam mode
Pause the game and press Up, Right, Down, Right, Up, Left, Down, Right, Up. Then, fly to the marker at the top of the GNN building to change to Bizarro. To change back to Superman, go to the marker at the other end of Metropolis.

Infinite city health
Pause the game and press Y, Right, Y, Right,, Up,, Left, Right, Y.

All power-ups
Pause the game and press Left, Y, Right, X, Down, Y, Up, Down, X, Y, X.

All bonuses
Pause the game and press Left, Up, Right, Down, Y, X, Y, Up, Right, X to unlock all bonuses.