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Timed rewards are only useful to the player if s/he has any lives left and if the reward can actually be used in the level that is being played. More often than not, that is not the case.Remember that timed rewards are part of the challenge and fun. But at the time of timed rewards it's helpful at the time it is awarded to the player. It may have limit of use but gets the game faster and efficient. So I don't see any negatives of the timed booster.