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| Factor | × | How it was derived |
|---|---|---|
| Style | 1.30 | Race 1.00 · Puzzle 1.30 ←the highest tag counts; tags do not stack |
| Difficulty | 1.80 | Advanced |
| Length | 0.90 | Bucket 1 (20-37 s) |
| Bonus | 1.00 | No bonus applies |
10 × 1.30 × 1.80 × 0.90 × 1.00 = 21.06, rounded to 21. Why these factors.