Why doesnt Super Smash Bros. brawl work on your wii

4 possible reasons:
1. You're putting it in the wrong way (non-illustrated side toward the majority of the wii)
2. You need a software update (should tell you when you try to play the game)
3. Your Wii has dust on it's reader and therefore can't read any games (test this)
4. The brawl disk is damaged in some way (scratched, chipped, etc.)