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"The Jewel Thief must collect all of the jewels scattered throughout the level. The platforms are timed, so be sure to time your jumps carefully. Reach the end platform to level up." Another way to say this would be: "The Jewel Thief must use their skills to collect all of the jewels scattered throughout the level. They must also be careful not to fall off of the platforms, which are timed. If they can reach the end platform, they will level up."
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