THE BIG BANG THEORY Ultimate Genius Party Game features 4 different game challenges, each inspired from some of THE BIG BANG THEORY'S funniest moments. Players are divided into 2-4 teams and roll a special die each turn to determine which game they will play. These games include Counterfactuals, Fun with Flags, Sketch Charades, and Celebrity.

In Counterfactuals, a member of the opposite team will draw a card that suppose a world that is different from our own in one key aspect, and asks a question about that world. The competing teammates must choose from multiple-choice answers, and gain points if their answers match each other's, as well as if they match the game writers' answer.

The goal in Fun with Flags is for a player to guess flags from a deck of cards based on clues given by a teammate. The twist is that there are 3 Oops Words that the Clue-Giver cannot say.

Sketch Charades is a simple drawing game, where one teammate will draw a card with a phrase, then has to draw it for another teammate to guess.

Finally, Celebrity is a charades game, in which one teammate is chosen to be the Actor and all the other teammates are the Guessers. An opposing team chooses answers for each of 5 categories for the Actor to act out.