It's pretty simple. Everyone (up to 6 people) gets a hand of cards. Most of these cards are blue noun cards - people, places, things, or events. A starting player puts one down, and then players take turns adding noun cards by answering the questions on the sides of the cards.
What is Situations?
Situations is a game where you and your friends (or acquaintances, or classmates, or family, or mortal enemies) construct the situation of a story together, taking turns adding people, events, places, and so on, and then each player writes their own story by interpreting the web of relationships they just created! It's a way to get creative with your friends, help you find time to write, or force the people around you to figure out how exactly a shark would go to university.