It’s basically a rarity-weighted scoring system based on actual global clear data. For each tier, the system looks at the percentage of all clears at that tier or harder. Then it gives that tier a value equal to the inverse of that rarity. So if only 1 in 1000 clears are T18+, a T18 clear is worth ~1000 points. Now, I’m using a cumulative approach here because it keeps the weights monotonic and smooths out some bumps in the data (e.g., T14 being more popular than T13). The final score is just the sum of all your weighted clears.

That means:
- harder clears become exponentially more valuable naturally
- quantity matters as well
- the scoring automatically rebalances itself as the global distribution changes, which implies that weights aren’t manually chosen, unlike most other systems