Tunnel is an Endless Game in Rhythm Heaven. 12 medals are required to unlock it. The player plays as a character holding a tin and stick in their hand as woman is driving a car along the road. The player must hit the tin with the stick in time to the beat of the music (count 1, 2, 1, 2), and keep it consistent through the whole game. The driver will occasionally drive through tunnels which will silence the music to throw off the player. If hitting the tin becomes off beat too long, the woman will become irritated and stop the car, thus ending the game. The longer she drives will determine the player's score.
