There are only a couple of cheats or glitches that can be accessed on City.
1. The rubble in the main area
Near the main centre of the level turn with the two story house on your right, go left and up a small uphill path. If you stand directly centre, to your right will be an alleyway. To your left will be large rubble where you are not allowed to go. Head to the rubble where the wire fence is and face the doorway with the rubble on your left. Crouch down several feet away from the steps of the door then stand up, run to the steps and move left once you get to the top step. If you can do this, you will notice yourself moving on top of the invisible boundary set up by the level creators. The objective is to hop over the boundary. Keep doing this until you can hop over the blocks and fence to the other side.
2. The other secret area behind the main house.
The main house is located pretty much in the centre of the level. It has two floors to it so it's the easiest house to identify. Go to the second floor of the house and run all the way to the path until it starts to slope down. Aim in with your pistol and tilt your nunchuck to the right as you move to the right against the rail. The objective is to get on the rail. If you start where the rail starts to slope down, you should be able to hop on the rail and go all the way to a secret area behind the house. From here you can see any enemies and anyone inside of the house.
Added by: MenaceSG Oct 2nd 2009, ID#3176