Halo 3: How do you do a custom game and Forge?

[MEHDI]

In Halo 3 How do you do a custom game and Forge?

Like I tried custom games but I am the ONLY one playing theres no one else and whats forge?

I am new please help!

 

[Big Bob]

To do a custom game you have to invite people. Or join a friends game or join a recent players game. Custom games arent matchmaking. Forge lets you edit maps you can delete items add items and add anything you want. I like to build racetracks. and Huge ramps.