C1a) During the solve the competitor must only use one hand. Penalty: disqualification of the solve.
C1b) During the solve no other body part or any object other than the surface must touch the puzzle. Penalty: disqualification of the solve.
C1b2) If a puzzle defect occurs, and the competitor decides to repair it, then repairing must be done with one hand, use of the surface is optional. Penalty: disqualification of the solve.
C1c) During the solve, once a competitor touches the puzzle with one hand, he must not touch the puzzle with the other hand. Penalty: disqualification of the solve.