The first three levels are fairly simple.
Russian Federation and Uruguay have already assured their places in the last 16 of the competition and when they kick off their game in Samara they will have no way of knowing who their possible rivals will be in the next round.
Andres Iniesta's lacklustre performance symbolised Spain's problems in this tournament.
The top two teams now have the same number of points, goal difference and goals scored - they are separated by Fair Play records (Spain have one yellow card and Portugal have picked up two). West Germany were runners-up in Group E behind Denmark.
They will win the group if they win and Portugal do not.
Quaresma's wonder goal against the Iranians made him the oldest Portugal player to score at the World Cup, at the age of 34 years and 272 days.
How Iran can qualify: Iran take on Portugal in the final game of the group stage knowing that only a win can help them qualify.
Brazil need a win or a draw against Serbia on Wednesday to make it through, and will also top the group unless Switzerland better their result against Costa Rica. Iran would secure their spot with a win and could also go through with a draw if Spain lose to Morocco. As the final group stage matches get set to kick-off, lets look at who has shined and who has faded.
Switzerland got a huge last minute win over Serbia in the second game but it was overshadowed by other concerns. They can also move on with a loss to the Swedes if Germany lose to or draw with South Korea, who have no points.
Colombia 1-2 Japan: Yuya Osako header seals emotional opening win
Japan brought on Hotaru Yamaguchi for Shibasaki with 10 minutes remaining, replacing Osako with Leicester's Shinji Okazaki . Pekerman also subbed out experienced midfielder Juan Cuadrado earlier than anticipated in response to Sanchez's red card.
African sides Egypt, Morocco and Tunisia were eliminated after two consecutive defeats, dimming hopes of Africa finally fulfilling Brazil legend Pele's prophesy of a World Cup win by an African team. A draw would require Spain to lose by at least two goals for Iran to advance.
If both Germany and Sweden draw their games, then the team in the higher-scoring game will finish second.
Croatia will top the group if they beat or draw with Iceland. Wins for Germany and Sweden would mean three teams would finish with six points, sending it to tiebreakers.
Japan sit in the box seat here, as they meet winless, hapless and eliminated Poland on Friday at 2am.
Another scenario could see Germany advancing on a better goal difference with a victory over South Korea even if Sweden beat Mexico. If both Sweden and Germany win it is possible for the Swedes to advance on goal difference.
At the World Cup, players have the opportunity to seal their legendary status by leading their countries to glory, while the billions watching football's greatest tournament can be the best opportunity for obscure players to launch their careers into stardom.
South Korea can qualify if they beat Germany and Sweden lose by a bigger margin than South Korea win.
England and Belgium are locked together at the top of the group, both guaranteed to progress.
With their draw Sunday, Japan and Senegal remain the surprise leaders with four points apiece. In Algeria's final match in the group stage, it edged out a 3-2 victory over Chile, placing it second in the group behind Austria.
