iPhone (iOS 15.0+) · Coming soon
Raise them from larvae,then sumo on a log.
Raise rhinoceros beetles and stag beetles from larvae. Care for a larva from Grandpa, catch beetles in the night forest, pair a male and a female for the next generation, and take on sumo tournaments on a log.
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Made for
- Anyone who loves rhinoceros and stag beetles
- Families who want to play together
- Players looking for a game with no ads
What it does
- 01
One real day is two weeks
One real day is two weeks for the beetles. You start in May with a big rhinoceros beetle larva from Grandpa, and it becomes an adult in June.
- 02
Care that works like the real thing
Beetles grow from egg to 1st, 2nd and 3rd instar larva, prepupa, pupa and adult. Keep their food (fermented mat, plus fungus bottles in the full version) fresh and moist. Changing food during the prepupa or pupa stage breaks the pupal chamber and can ruin emergence. Changing it too often stresses larvae, and several larvae in one container grow less.
- 03
Temperature shapes size
Keep containers in the room, in outdoor shade, or in a climate box (full version). Cooler larvae grow slower but bigger (the temperature-size rule). Too hot or too cold weakens them.
- 04
Genetics based on research
Adult size depends mostly on how the larva was raised, while the shape of horns and jaws relative to body size is inherited. Horns grow along an S-shaped curve with body size, and overly long horns are weaker in fights. White eyes and red bodies are recessive traits (simplified for the game). Pair a male and a female to get eggs, and breed over generations.
- 05
Catch beetles in the night forest
From June to September, you can visit the forest three times a day. Search sap flows, banana traps, lights and tree roots in four places: coppice woods, mountain forest, riverside woods and a town park. Some beetles fly away.
- 06
Sumo on a log
Beetles push each other on a log. Push your opponent off or flip it over to win. Tournaments are held by weight class: town, prefecture, national and world.
- 07
Field guide and size records
There are 16 species: 10 from Japan and 6 foreign species in the shop. Fill in the field guide and chase size records for each species.
How it works
- A
Raise a larva
Keep the food fresh and moist, watch the temperature, and wait for it to emerge.
- B
Catch in the forest
From June to September, check sap flows and traps.
- C
Breed and compete
Raise the next generation and enter tournaments by weight class.
Screens
Free to start, one-time unlock
- Free: the first summer (until September of year 1), 4 Japanese species (rhinoceros beetle, saw stag, flat stag, small stag), the coppice woods, the town tournament, and up to 6 containers
- One-time unlock: all 10 Japanese species, all 4 forests, fungus bottles, climate boxes, breeding over generations, up to 40 containers, every tournament, and the "+2 weeks" fast-forward
- Optional: the Foreign beetles pack (6 foreign species in the shop) and the Supporter pack (wooden cases, looks only)
- No ads, no subscription
- A grown-up check (a simple sum) appears before purchases and external links
FAQ
Can I release real beetles outdoors?
Please never release beetles outdoors, especially foreign species, which can harm local nature and wildlife. If you keep beetles, please care for them until the end.
Which species are in the game?
10 Japanese species (Japanese rhinoceros beetle, small rhinoceros beetle, saw stag, miyama stag, giant stag, flat stag, small stag, striped stag, nebuto stag and red-legged stag) and 6 foreign species sold in the shop with the Foreign beetles pack (Hercules, Caucasus, Atlas, giraffe stag, Palawan stag and rainbow stag).
How fast does time pass?
One real day is two weeks for the beetles. In the full version, you can also fast-forward with "+2 weeks".
Are there ads or subscriptions?
No. The first summer is free, and a single one-time purchase unlocks everything. The Foreign beetles pack and the Supporter pack are optional extras.
Could my child buy something by mistake?
A grown-up check (a simple sum) appears before any purchase and before links that leave the app, such as this website. Purchases are processed by Apple.
How do I restore purchases?
Tap Restore purchases in the app, signed in with the same Apple Account you bought with.
Can I move my progress to a new device?
There is no account, and your beetles and records are saved only on the device. Purchases come back with Restore purchases on the new device.
Where are the Terms of Use?
See the Terms of Use at https://legal.irodori-labo.com/terms/.