The first was the challenge "Tunnel Ball", in which they triumphed over Bedok Secondary School and subsequently entered the quarterfinal. Preparation took up about two weeks prior to the event. The challenge was to pass a ball under one's legs and over one's head as quickly as possible, with the last person receiving the ball running to the front to pass it again. The school that completed the most passes would be the winner. However, if one person were to drop the ball, the count would reset to zero and the school would have to start again.