In Happy Biiirthday, players sing the song "Happy Birthday" together and reveal Candle cards from their hand simultaneously, following the beats. The player whose color is shown the most among the revealed candles has to sing the next sentence of the song on the beats quickly. If you forget to sing OR accidentally sing on another player's behalf, you get the penalty!

Watch out for the Unlit Candle card! Nobody should make a sound when it is revealed! Follow the beats by heart so that you can catch up with the song when it comes to your turn!

You can play Happy Biiirthday in competitive or cooperative mode. Two variant rules are waiting for you to make singing the song even more challenging!

—description from the publisher