Clean The Library tier list

S tier: mandatory from the start

Golden Diamond earns its S slot because +3 carry capacity shows up immediately and does not fade in value as you get better at the game. Every trip for the rest of a round benefits from it. Assemble joins it because pulling scattered piles together cuts the dead distance between pickup points. Two players with Golden Diamond and Assemble active will outpace four players running base stats in most round formats.

A tier: high value, not unconditional

Azure Star is A and not S because its carry bonus (+2) is strong but half the size of Golden Diamond. It is still an early buy, but the distance between first and second place in carry is meaningful. Sort lands in A because pile management genuinely matters in squads that dump mixed books near central lanes. In a perfectly organized squad, Sort drops to B. In a chaotic pub group, it would nearly reach S. A tier is the honest average.

B tier: situational but real value

Crimson Octagon is B because the jump upgrade only pays off when you are actually doing Floor 2 elevated-platform cleanup. Floor 1 does not need it at all. Insight is B because it solves a real problem (misplaced books blocking a perfect score) but only at run end. Most rounds end before players reach the audit phase, especially in casual co-op sessions. The value is real; the situation is specific.

C tier: eventually yes, early no

Emerald Club (sprint), Shelf Guide, and Auto-Shelving all make the game more comfortable after a certain point. Sprint matters when you know every aisle. Shelf Guide matters when spine-color ambiguity still costs you time. Auto-Shelving is a long-aisle finisher that costs more Robux than it saves in the first 20 rounds. None of them are bad purchases. C tier means "buy after the rest, not instead of them."

For the specific priority order within keys alone, see the keys guide. For the full 9-step purchase sequence, see the upgrade order guide.

The tier list is not just a purchase order. It is also a tool for deciding which ability to cast when cooldowns are limited. In a round where you have not yet bought Unlimited Magic, you want to cast S-tier abilities (Assemble) early and save B-tier abilities (Insight) for the cleanup phase.

If your squad is stuck on a plateau where the round feels slow even after buying carry keys, the most common culprit is pile scatter (fix: Assemble and Sort) rather than movement speed (fix: sprint). Check which group is the real bottleneck before spending on movement upgrades.

Finally, the abilities guide covers the specific trigger conditions for each magic ability in more detail. The tier list gives the relative ranking; the abilities guide explains exactly when and why to cast each one.

Ready to plan which upgrades to buy in what order?