 For the most part, the player is free to move forward and backward through a given level as desired.As the player progresses, characters become more powerful by picking up power-ups for the attributes of speed, jump, and power.Power-ups do not "roll over" into the character pool if the current character is at the maximum for the respective attribute, meaning a character can only gain attribute points from a power-up if that character is in play when the power-up is collected.