You have to wait until after the Warworld mission against Mongul at the beginning of the game. After you beat Mongul, you will return to Metropolis. As soon as you can pause the game, pause it and enter the above codes. It takes a second, but you will hear a sound confirming each code. Wait for the sound and the code is yours.
The code is available on the Superman Returns DVD - it has been reported as:
Up, Right, Down, Right, Up, Left, Down, Right, Up
Simply enter the code and fly to the top of the GNN building where you will have the ability to transform to playable Bizarro. Wreak havoc throughout the entire open world of Metropolis as Bizarro for an unlimited amount of time, and simply fly to the threat indicator located at the other end of Metropolis to change back to Superman.
Pick up any pedestrian near the daily planet building (not one in distress) and go up to the top with of the daily planet building him or her. There should be some kind of walls sticking out of the sides. Land on it(it might be to slippery so try another one if it is)then drop him or her. Then quickly drop down to the ground. As you might have thought,the civilian will slip down and fall on its ass. So watch the dork head fall from the building. When it will reach the ground, it will just get up and start running (or walking if you did not terrorize it).
Armageddon Averted (30) - Complete Level 01: Meteor Storm
Frequent Flyer (30) Â– Travel 10,000 Miles
Heavy Lifting (30) - Lift 10,000 Tons
Hero of Metropolis (200) - Complete All Metro Events And Mini-Games
Me aM savE yOU (100) - By you is Bizarro not undefeated!
Metallo Mastered (100) - Stop Metallo in the name of justice
Mr. What's-his-name (50) - Complete All Mini-Games
Mr. Whiskers (50) - Find All Kittens
Roadside Assistance (30) - Pick Up 100 Cars
Souped-Up Superman (30) - Obtain All 15 Power-Ups
Super Sonic (20) - Finish all Fast Flyer Mini-Games
The Greatest Day (30) - Play for 12 Hours
The Mongul Hordes (100) - Vanquished Mongul once again
Twisted (100) - Save Metropolis from the rampaging tornado
Versatile Fighter (30) - Perform 99 fighting combos
Warworld (50) - Visit and dominate Warworld
You Am Bizarro! (20) - Complete The Bizarro Mini-Game
Globe Bowling Trophy-Throw Globe off Daily Planet Building
Bizarro Unchampionship Trophy- Get high score with Bizarro by destroying town with certain (?) amount of time
Photo Finish Trophy - Defeat 500 enemies
Outstanding Valet Trophy- Destroy certain amount of cars (?)
Kitten Finder Extraordinare - Find all 100 kittens for Mr.Mystlypyzk challenge
Meteor Mayhem Trophy-Save Meteors from Metropolis in beginning of game
Bizzaro Unchampion Trophy - Complete all the Bizzaro mini-games
Globe Bowling Trophy - Pick up the Daily Planet globe
Kitten Finder Extraordinaire - Rescue all 100 Kittens
Meteor Mayhem - Complete the 1st level of the game
Outstanding Valet Trophy - Pick up 500 Cars
Photo Finish - Defeat 500 enemies
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