Jack "defuses" the bombs by simply touching them. As soon as he has touched the first, he triggers a sequence in which another bomb's fuse lights up, and so on. A player can score a bonus in each round by touching 20 or more bombs in the correct lit-fuse sequence. Jack may also defuse an unlit bomb by touching it, but this impedes his opportunity to score the bonus for that screen. It also delays the appearance of the game's bonuses and power-ups. Bomb Bonuses are triggered when Jack touches the first of 24 onscreen bombs. It is possible to collect the remaining bombs in fuse order, the maximum being 23 (the top score possible on a level). Expert players would combine this with X5 'b's for the largest multiplier score available.