Incorrectomundo.
If a game must produce a result - i.e. it's a cup final, or something - then if the scores are level at the end of normal time (90 minutes) including any stoppage (injury) time played, then an extra 30 minutes (15 minutes each way) is played.
This is Extra Time.
For games that really really must produce a result, like the World Cup Final, after this it can go to penalties or the Golden Goal.
Peter
[link|http://www.debian.org|Shill For Hire]
[link|http://www.kuro5hin.org|There is no K5 Cabal]
[link|http://guildenstern.dyndns.org|Blog]