The aim of this game is to guess the mystery number within 20 questions. To play, someone thinks of a number. Everyone else has to ask yes/no questions to try to  figure out the number (refer to the question ideas page for the types of questions that could be asked). NOTE: these questions can’t be players guessing specific numbers, this can only happen once the stars are reached. Students need to make sure they use the information they already know about the number from the questions previously asked. The star represents the exact time when students can use the information they have found out about the number during the game and ask if it is a specific number e.g. Is the number 34?