Complex sentence: The aim of the game is to get exactly, or as close to, 100 points by 12 questions, and the answer to each question is a number, which is the amount of points you have "to play with".
Split into simpler sentences: The aim of the game is to get exactly, or as close to, 100 points by the end of 12 questions. The answer to each question is a number, which is the amount of points you have "to play with".