How extra time, penalty rules work for Argentina

Cape Verde is giving Argentina a game.

There's no guarantee that the World Cup Round of 32 game goes to extra time -- but if it does, it'd be quite dramatic.

Lionel Messi's opening goal seemed like it'd have Argentina safe.

But when Cape Verde scored in the second half, it was 1-1, and anything felt possible.

If it goes to extra time, this is how the rules work.

World Cup extra time rules for Argentina-Cape Verde

There is no golden goal, also known as "sudden death."

Instead, if Argentina and Cape Verde are tied at the end of regulation, they play two 15-minute halves of extra times. They switch ends at halftime of extra time.

Even if a team scores a goal early in extra time, the entire half hour of extra time has to be played.

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There is also stoppage time at the end of each half of extra time, if there were any injuries, substitutions or other stoppages in that span of time.

Teams also get an additional substitute to use during extra time.

If it is still tied after the 30 minutes of extra time, it goes to penalties.

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World Cup penalty rules for Argentina-Cape Verde

If the match goes to penalties, it sets up for five penalty takers on each side.

Any player who was on the pitch at the end of extra time can take a penalty for Argentina or Cape Verde.

The teams alternate, and at the end of five kicks apiece, if one team is ahead, they advance.

If the teams are tied after five kicks, they go to sudden death, one round at a time to determine who moves on in the World Cup.