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A power-up is a core game mechanic that temporarily enhances a player's abilities, such as granting invincibility, speed boosts, or weapon upgrades. It serves as a reward for skill or exploration, adding strategic depth and pacing to gameplay. Symbolically, it represents empowerment and progression, often breaking monotony or aiding in overcoming challenges. In design, power-ups create memorable moments and encourage risk-reward decisions, making them a timeless element across genres from platformers to shooters.