Check map state before rolling
Hidden slimes are usually tied to maps, update windows, or special conditions. Read the latest update notes before using high-value boosts.
Keep screenshots or notes for event-only discoveries so you can compare changes when the game updates.
Prioritize rotating content
When a limited event is live, clear those targets first. Permanent slimes can be farmed later, but rotating slimes may disappear or move to a worse rate pool.
The collection tracker is built for this: mark what you own, then focus on missing hidden and event entries.