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Overview
The Collection Log is a tracking and achievement system in inZOI that records every gathered item your household has ever collected. It was introduced in the v0.3.0 update (August 20, 2025) alongside the free Island Getaway DLC. The Collection Log gives completionist and achievement-oriented players a structured set of goals to work toward. It tracks fish species caught, gemstones mined, crops harvested, jewels crafted, tools obtained, and information gathered through conversations. Completing sections of the log unlocks exclusive furniture rewards, and filling the entire log may unlock a hidden bonus reward.
How to access
The Collection Log is accessed by clicking the book-shaped icon located just below the Property notification board on the right side of the screen during gameplay. The log is a Family Collection Log, meaning it tracks items collected by any member of the household, not just the currently controlled Zoi. If one family member catches a rare fish and another mines a rare gem, both entries appear in the same shared log.
The log opens to a visual grid showing silhouettes for undiscovered items and full-color icons for collected ones. Each entry includes the item's name, a brief description, and hints about where or how to find it. These hints are particularly useful for the Mining category, as they specify which mining spot types yield each gemstone.
Categories
The Collection Log is divided into six main categories, each tracking a different type of collectible:
Fishing
The Fishing section tracks every fish species caught by any household member. Fish are divided into freshwater and saltwater categories, with species further organized by the location and rod tier required to catch them. The full fish catalog spans species available in Dowon (Harang River Park), Bliss Bay (Sunset Bay and North Beach), and Cahaya (beach, boat, and park fishing spots). Many fish also have day/night requirements.
Completing the fishing section requires visiting all three regions, upgrading to a Diamond or Jewel-tier fishing rod, using Advanced Bait to improve odds on rare catches, and fishing at different times of day. Species like Orca, Whale Shark, and Giant Manta Ray from Cahaya boat fishing are among the hardest to collect. Non-fish items like Garbage and the Biko Doll also have collection entries. See the full Fishing article for a complete species list with rod and time requirements.
Farming
The Farming section tracks all crop varieties harvested by the household. Players place farming plots in Build Mode and use tools like rakes and watering cans to cultivate land. Available seed types include Banana, Tomato, Mango, Sweet Potato, Potato, and Corn. Each crop type has multiple quality variants to discover, and growing conditions (including fertilizer type and temperature) affect the results.
A notable farming secret: using a Jewel Watering Can (crafted using diamond materials) on crops may yield special gem-infused crop variants that count as separate entries in the log. Higher-quality fertilizer increases the rarity of crop variants. Omitting fertilizer entirely produces bug-free but standard-quality crops. This creates a crossover between the Farming and Mining collection paths.
Mining
The Mining section tracks every raw gemstone and mineral collected through mining. Entries are organized by mineral family (Mica, Sodalite, Crystal, and precious stones) and include location-specific gems like Green Mica (Dowon only), Black Opal Raw Stone (Dowon/mixed spots), and Larimar (underwater sandpiles only). Upgrading pickaxe tiers progressively unlocks access to rarer gemstone entries.
The mining section is considered one of the harder categories to complete due to gems like Pink Diamond, which has an extremely low drop rate even with a Diamond Pickaxe. Maintaining a "Feeling Concentrated" mood state (using consumables like donuts) improves rare gem discovery rates. The Collection Log descriptions for each undiscovered gem provide hints about which mining spot type to target.
Jewels
Separate from raw gemstones, the Jewels section tracks polished and cut jewels created at a Crafting Table. Raw gemstones from mining are refined into finished jewels through the Handiwork skill. Higher Handiwork skill levels unlock more advanced cutting techniques, producing different jewel qualities and styles that each have their own collection entries.
Completing the Jewels section requires both collecting a wide variety of raw gemstones and leveling the Handiwork skill high enough to perform all available cutting methods. Since Handiwork can only be leveled by crafting, this section rewards persistent crafting effort.
Tools
The Tools section tracks the four primary gathering tools and their tier variants:
Rake used for farming. Available in multiple material tiers.
Watering Can used for farming and crop maintenance. Ranges from basic to Jewel quality. The Jewel Watering Can produces special crop variants.
Pickaxe used for mining. Tiers: Stone, Copper, Steel, Gold, Diamond.
Fishing Rod used for fishing. Tiers: Wooden, Copper, Iron, Silver, Gold, Diamond.
Tools can be purchased at the Farm Store in Cahaya (which stocks lower tiers) or crafted at Crafting Tables using gathered materials. Each tier of each tool type has its own Collection Log entry, so obtaining every variant is required for full completion. The Whatever Tiny Shop in Cahaya rotates three random items daily and may occasionally stock high-tier tools.
Info
The Info section is a unique category that collects information gathered through conversations and social interactions rather than physical item gathering. As your Zois talk with other characters, learn about the world, and uncover details, entries in the Info section fill in. A useful interaction is "Ask about info on encyclopedia" talking to NPCs who are performing the same gathering activities as you (fishing, mining, collecting) can sometimes reveal hints for obtaining specific collection items.
Rewards
The Collection Log is not just a tracking system. Completing sections actively rewards players:
Set completion rewards filling out all entries within a specific subcategory (e.g., all freshwater fish, all mica-family gems) unlocks exclusive furniture items that cannot be obtained any other way. These are special decorative pieces for your Zoi's home.
Category completion rewards completing an entire main category (e.g., all of Fishing) unlocks additional, more significant rewards.
Full completion bonus filling the entire Collection Log across all categories may unlock a hidden reward. The exact nature of this reward has not been fully confirmed by the community.
Rewards are automatically delivered to the household and can be placed through Build Mode. The exclusive furniture items tend to be thematically tied to the collection they came from. Fishing-related furniture for completing fish sets, crystal-themed decorations for completing gem sets, and so on.
Tracking across the household
Since the Collection Log is family-wide, different household members can specialize in different gathering activities and all contribute to the same log. For example, one Zoi might focus on fishing while another concentrates on mining and a third handles gardening. All of their collected items count toward a single shared log. This makes larger households naturally more efficient at filling the Collection Log, as they can cover more ground simultaneously.
Each household member builds their own skills independently: the Zoi focused on mining develops the Collecting and Handiwork skills, while the Zoi focused on fishing develops the Fishing skill. This specialization makes each family member more effective at their chosen gathering activity over time.
Completion strategies
Start with common entries first. Don't burn out chasing rare items early. Fill in the easy entries across all categories to build momentum and unlock early set rewards.
Visit all three regions. Some items are region-exclusive. Dowon has Green Mica, Cahaya has underwater sandpiles for Larimar and Pearl, and Bliss Bay is a strong all-around mining region. Each region also has unique fishing spots.
Upgrade your tools progressively. Higher-tier tools (Diamond Fishing Rod, Diamond Pickaxe, Jewel Watering Can) unlock collection entries that lower-tier tools cannot access.
Use mood boosts for rare finds. The "Feeling Concentrated" mood state improves drop rates for rare gems like Diamond and Pink Diamond. Keep consumables like donuts on hand to maintain concentration.
Fish at different times of day. Many fish species are day-only or night-only. You will need to fish during both daytime and nighttime to complete the Fishing section.
Use the "Ask about info on encyclopedia" interaction. Talk to NPCs performing gathering activities to get hints for the Info section and learn about undiscovered items.
Check the log regularly. The silhouette system shows you exactly what you're missing. Use the descriptions and hints provided for undiscovered items to guide your next gathering session.
Use Advanced Bait for rare fish. The 5 Meow cost per cast is trivial compared to the time saved when hunting for the rarest fish species at Cahaya boat spots.
Assign household members to specialize. Since the log is family-wide, have different Zois focus on different gathering activities for maximum efficiency. One Zoi can develop high Fishing skill while another maxes out Collecting.
Check the Whatever Tiny Shop daily. It rotates three random items and may stock high-tier tools, saving you the crafting grind for tool collection entries.
Related activities
The Collection Log connects to nearly every gathering and crafting system in inZOI:
Fishing populates the Fishing section with caught species. A dedicated skill that improves with practice.
Mining and Gems populates the Mining and Jewels sections. Tied to the Collecting and Handiwork skills.
Gardening populates the Farming section with harvested crops. Using a Jewel Watering Can creates special variants.
Skills Fishing, Collecting, and Handiwork skills all directly impact gathering efficiency and collection progress.
Crafting Crafting Tables are needed for gem cutting (Jewels section) and tool creation (Tools section).
Snorkeling, required for underwater-exclusive collectibles like Larimar and Pearl. Needs snorkeling gear and the Swimming skill.