Super Smash Bros. Brawl/Modes

Tourney
Tourney mode might give you a hint of what it is. A tournament! In Tourney mode, you have a tournament which can have up to 32 players. You decide(in the settings) how many players you want per round - 2, 3 or 4. The tournament carries on until someone reaches the finals and wins! The Tournament mode is for deciding who is the top player. If you don't have other players to play with, you can play on your own while all the other competitors are computer players.

Stage Builder
Stage builder is one of the really entertaining section of the game and... you get to build your own stage! Customised stages! You create the stage by selecting the size, background, floors, other stuff like ladders and spikes and finally music. Sadly, you can only choose music from the game, not any music that you like. Thankfully, you can save the stages you have made on an SD card and play that stage as many times as you want. If you have Wi-Fi connection, you can submit your stages to Nintendo and even receive stages that other players have made around the world!