Guide
Breeding and Eggs Guide: How to Get Perfect Jinies
Egg groups, inheritance rules, hatch times, and whether breeding beats catching for perfect Jinies.
Breeding is not the fastest way to a perfect-stat Jini, and treating it that way will burn a week of nests. It is the best zero-spend way to keep a variant after its season ends and to move a good Nature onto the species you want. Use it for variants and long-term copies; use fixed eggs from dungeons and the season shop for perfect stats.
How you unlock breeding
Breeding is a Home system, not a standalone unlock. Push the main story to chapter 3 of Wind Sleep Province, unlock your Home, and upgrade it to level 2 — that gives you two Jini nests (CN build, Season 3). Both nests are needed: one holds the male, one holds the female, and they must be placed close together. Your Home level is the gate, so a player who skipped Home content cannot breed yet. The home and gardening guide covers the upgrade path.
Egg Groups, and why old tables are wrong
Every breedable Jini belongs to an Egg Group, and both parents must share one. This is the part of the system that changed most: CN players documented a rework during Season 1 ("the Cube egg group has been changed"), and older guides still circulate the pre-rework groupings. Do not copy a table from a launch video. Check the current egg group in-game or through a community lookup, and re-check after a season update.
Examples of the newer groupings include Object, Animal and Machine. Some Jini have no usable group at all: legendaries, Dimo and season-pass variant eggs have been described as unknown egg group and cannot be bred (CN build, Season 3; single source). That matters if you are trying to breed a variant you missed.
Inheritance rules
The short version: the offspring is the mother's species, and the father influences variant odds. That means you breed a male Shiny with a normal female of the species you want, and you have a small chance at a Shiny egg of the mother's line. The reverse does not work — a female Shiny does not pass her variant to a different species.
Nature inheritance is the practical reason to breed. CN guides advise keeping both parents in the same egg group with the correct Nature, because the egg is more likely to come out with a usable Nature. What the sources do not publish is an official stat or IV formula; the percentages in the next section are community estimates. Do not assume an egg will inherit perfect IVs; the perfect-stat eggs described in guides come from dungeons, season shops and Prism Ball contracts, not from the nest.
Hatch balls, Natures and growth stats
A CN breeder's two-week log is the only source we have that puts numbers on inheritance, and the author says up front that it gathers other sites' material rather than controlled tests (CN build, Season 3; single source, unconfirmed). Treat every figure here as a community estimate.
Nature inheritance is reported at 30% from the father and 30% from the mother, stacking to 60% when both parents share a Nature. Changing a parent's Nature with a mirror does not change what it passes on — the original Nature is inherited — while a growth stat changed with a gold key is inherited.
The post counts "growth stats" per parent: how many of its stat rolls are already the ones the breeder wants. A 3+3 pairing means both parents bring three correct rolls. With a standard ball, the reported chance that the child ends up correct on all three is 44.14% for 3+3 and 30% for 3+1.
| Pairing | Standard ball | King Ball |
|---|---|---|
| 3 + 3 | 44.14% | 57.65% |
| 3 + 1 | 30% | 41.56–48.57% |
| 3 + 2 | not recommended | 48.57–57.65% |
| 2 + 2 | not recommended | 48.57–57.65% |
The King Ball column gives two figures for the 3+1, 3+2 and 2+2 cells; the source does not say which setup produces which one. What it does say is that 3+2 and 2+2 pairings without a King Ball often yield a child with only two correct stats, which wastes the nest time.
Taking the egg with a King Ball — the community calls it midwifing — is the biggest lever in the post, and it advises buying the King Ball from the Traveling Merchant on every restock. The King Ball is reported to guarantee three growth stats plus a growth stat in the Nature-boosted stat, but those guarantees overlap when the boosted stat is already covered: if both parents carry a Speed growth stat and the child inherits a Speed-boosting Nature, the extra guarantee is largely spent.
The same author warns that a wrong growth stat is worse than a missing one. Any incorrect value on a parent sharply lowers the chance of a clean child, so a 3+1 parent beats a 3+2 parent carrying a stray stat. Two further claims in the thread are flagged as untested: that replacing parents with their own perfect offspring speeds laying from one egg a day to two, and that Prism Ball hatching can disturb inheritance. Neither has data behind it, so do not plan around them.
Hatch time and limits
Hatch time runs from about 30 minutes to 24 hours depending on the egg (CN build, Season 3; single source). One guide recommends incubating up to three eggs at once to save time (single source). Normal eggs can be gifted to a friend once per day, but Shiny and Radiant eggs cannot be gifted, and raid or battle Jini cannot be bred at all. Plan around the gift limit if you are breeding for someone else.
The laying check, nest spacing and a layout hypothesis
Community testing puts one laying check every 30 minutes (CN build, Season 3; single source). Two things follow. Standing in the room does nothing between checks, and lifting a nest out and putting it back resets the accumulated timer — so do not rearrange the room while you are waiting. The same discussion could not reproduce the claim that rare or high-level Jinies lay more slowly.
For pairing, the breeder recommends one male to one female in a separate room. If two pairs must share a room, leave at least three nests between the groups; closer nests cross-pair and waste eggs.
A second CN post goes further, and is explicitly speculative. Reading a datamined rate table that may be test-server data, its author argues that laying is decided per connected group rather than per male. Nests within roughly 3.4 m form a group, each group gets a single check per 30-minute tick, the egg's sex is rolled afterwards, and a nest that has just laid stops counting toward its group. The developers have not confirmed any of this, and the author presents it as a hypothesis that matches his own laying experience.
On that assumption, splitting ten nests into two groups beats one dense block. Collecting every 30 minutes, a 6-nest group (3 females, 3 males) plus a 4-nest group (2 females, 2 males) models at about 6 eggs a day. Collecting every 12 hours, a 7+3 split models at about 5 a day. One fully connected 10-nest block models at only about 4.94 a day despite holding more parents. The author rejects the rival "every male rolls independently" model because it predicts roughly 25 eggs a day from a 4-female/6-male layout, which nobody observes.
Treat the layout advice as something to test, not a rule. The takeaway that holds under either model is the one above: do not cram every nest into one clump, and do not rebuild the room after the timer has started.
Is breeding the best zero-spend route to perfect Jinies?
No — not for stats. The reliable perfect-stat sources in the CN build are the fixed eggs from dungeons and the season shop, which arrive with three correct stats at +8 and the right Nature; using a Prism Ball contract upgrades them to +10 and Radiant (CN build, Season 3). Breeding is much slower and its variant odds are explicitly described as very low. What breeding is good at is insurance: it is the only way to keep producing a seasonal variant after the season ends, and the only way to move a Nature onto a line you did not roll well.
So the honest answer is "yes for variants, no for perfect stats". If your goal is a 5-star PvE carry, catch or buy the fixed egg and spend your keys there. If your goal is a Shiny you love, build the nest.
A practical breeding setup
- Keep one male Shiny per egg group as a stud; it is the piece that unlocks variants across several species.
- Run one male to one or two females, not one to four. Eggs are produced sequentially, so a wide setup mostly adds waiting (single source).
- Match Natures on both parents before you start; the egg is the only place that investment pays off twice.
- Label eggs by origin. The same guide that recommends breeding also warns that unlabeled eggs get mixed up and wasted.
- Do not breed just to enter PvP. One CN player reports that a gold key, a mirror and the four to five silver keys from weekly events are enough to tune a wild catch into a PvP-ready Jini each week, and expects the pressure to fall as later seasons add few species and hand out fixed eggs (CN build, Season 3; single source).
Breeding is a background task, not a session goal. Start the nest, go do the daily routine, and come back. If you want the full variant picture, the Shiny Jini guide covers pity and encounter pools.