Flash is an achievement where you need to reach level 501 in less than 1800 seconds. This begins from the second you travel back in time and you are given little to no time. This achievement has 40 total levels.
| Level | Requirement | Rewards |
|---|---|---|
| 1 | Reach level 501 in less than 1800 seconds |
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| 2 | Reach level 501 in less than 1584 seconds |
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| 3 | Reach level 501 in less than 1393.92 seconds |
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| 4 | Reach level 501 in less than 1226.65 seconds |
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| 5 | Reach level 501 in less than 1079.45 seconds |
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| 6 | Reach level 501 in less than 949.92 seconds |
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| 7 | Reach level 501 in less than 835.93 seconds |
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| 8 | Reach level 501 in less than 735.62 seconds |
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| 9 | Reach level 501 in less than 647.34 seconds |
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| 10 | Reach level 501 in less than 569.66 seconds |
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| 11 | Reach level 501 in less than 501.3 seconds |
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| 12 | Reach level 501 in less than 441.15 seconds |
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| 13 | Reach level 501 in less than 388.21 seconds |
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| 14 | Reach level 501 in less than 341.62 seconds |
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| 15 | Reach level 501 in less than 300.63 seconds |
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| 16 | Reach level 501 in less than 264.55 seconds |
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| 17 | Reach level 501 in less than 232.81 seconds |
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| 18 | Reach level 501 in less than 204.87 seconds |
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| 19 | Reach level 501 in less than 180.29 seconds |
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| 20 | Reach level 501 in less than 158.65 seconds |
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| 21 | Reach level 501 in less than 139.61 seconds |
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| 22 | Reach level 501 in less than 122.86 seconds |
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