S
Tier reflects current route usefulness, not confirmed hidden stats.
Clean The Library Sort Ability
Sort is the safest early upgrade signal because it improves the core loop: turning mixed piles into books that can actually be shelved.
mixed pilesco-op handoffsstarter routes
Community and competitor references consistently list Sort as an ability. Exact unlock cost, cooldown, and scaling stay unverified.
Use this ability when
Best route situations
Your team keeps dropping several themes into one pile.
A shelf route stalls because the correct books are hidden under unrelated volumes.
You want an ability that helps both solo and co-op runs without relying on exact map knowledge.
Be careful when
Situations to avoid
Your main problem is crossing distance instead of pile organization.
You are doing a strict no-magic or Pro Mode challenge.
Related routes
Use the ability inside a real run plan
Ability value changes by map section, team role, and whether the run is a casual clear, timed clear, or source-watch endgame attempt.