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Acceleration depends on upgrade purchases. In this game you progress by making purchases and performing upgrades. When you purchase upgrades your car starts to accelerate faster and gains speedier abilities. With each upgrade your car becomes quicker and more powerful. As you progress your car will be able to reach maximum speeds faster and faster. However upgrades can be expensive so to accelerate faster you must purchase as many upgrades as possible. When playing Protube Race Clicker you should also focus on maximizing your income so that you can afford to purchase the upgrades necessary to improve your car's performance.