What are the cribbage rules for scoring 31 and what happens when a player plays their last card?

In cribbage, scoring 31 is achieved by playing cards that add up to 31 points. When a player reaches 31 exactly, they score 2 points. If a player plays their last card, they score 1 point for "go" and any additional points for combinations of cards left in their hand. The first player to reach 121 points wins the game.