World 1
Spring Pond
Learn to glide. Slip between mossy rocks and lily pads, catch the golden petals before they sink, and mind your own tail.
Petalfin · iPhone game
Guide the koi. Catch the blossoms.
A calm watercolor pond with a tense little twist. Drag one finger to steer, eat falling cherry blossoms to grow longer, and try not to bite your own tail.
- 30hand-authored levels
- 3ponds to swim
- 8koi to collect
- 1finger to play
- 0ads or trackers
Three ponds, thirty levels
Every pond brings a new twist
Each world adds one clear idea, then builds on it. Level 1 is easy to win, and level 30 is hard but fair.
World 2
Rain Garden
Ride flowing currents, ripple through raindrops and dodge drifting leaf rafts. One of them has a frog.
World 3
Lantern Night
Swim by the light of floating lanterns and your own glow. A heron’s shadow warns you before it strikes.
Autumn Stream · coming soon
Frozen Lake · coming soon
Easy to learn, hard to put down
A quiet game with a little bite
Touch anywhere and drag. A floating joystick appears where you touched, and the koi turns toward it. Let go and it swims straight.
One-finger steering
Learnable in five seconds. The pond edge is soft, so the koi glides along it instead of stopping dead.
Grow with every petal
Each blossom makes your koi longer. The longer you grow, the more careful you have to be. Rocks do not budge.
Golden petals and par times
Three golden petals appear in each level and sink after a few seconds. A countdown ring shows how long you have.
Zen Mode
No goals and no fails, only an endless pond and soft music. Switch between spring, rain and lantern-lit night whenever you like.
Failure that is fun to watch
Bite your tail, bump a rock or meet the heron and the koi flinches with a comic “BONK!” or “SNAP!”, then Try Again is one tap away.
Gentle sound and touch
Koto and marimba music, rising notes for petal combos, and light haptics. Sound, music and haptics each have their own switch, and screen shake follows Reduce Motion.
Earn lotuses
Up to three lotuses on every pond
Lotuses are how you grow your pond. Spend the ones you earn on new koi, from a classic Kohaku to a rare Galaxy.
- 1Clear the pond
- 2Catch all three golden petals
- 3Beat the par time
KohakuSnow white with crimson clouds
ShowaInk black, fire red, paper white
OgonA single gleaming gold
TanchoOne red sun on a white crown
AsagiBlue net scales, sunset sides
GhostSilver mist, barely there
JadeRare · carved from green jade
GalaxyRare · a night sky in scales
A look inside
Watercolor calm, drawn in code
Every koi, petal and pond in Petalfin is drawn in code, and every sound is synthesized. Nothing is borrowed from anyone else.
Private by design
Nothing leaves your pond
- No account. You never sign in or create a profile.
- No ads, analytics or tracking. The game contains no third-party SDKs.
- On-device only. Progress, lotuses, your chosen koi and settings stay on your iPhone and are deleted with the app.
- Offline. The only network use is asking the App Store whether you have unlocked the Full Pond.
For everyone
Gentle enough for all ages
There is no violence, no chat and no user-generated content. A heron may “snap”, but nothing is hurt: the koi just flinches, ripples and tries again. Petalfin is built to be rated 4+.
Play for a minute on the train or an hour on the sofa. There are no timers to beat unless you want one.
The Full Pond
Start with five ponds, then unlock the rest
One in-app unlock, The Full Pond, opens everything else. No subscription and no ads, ever.
| Feature | Start | Full Pond |
|---|---|---|
| Levels 1–5 | Included | Included |
| Levels 6–30 in all three ponds | Not included | Included |
| Zen Mode | Not included | Included |
| Koi collection | Earn koi with lotuses | All eight, with Jade & Galaxy |
| Future worlds, including Autumn Stream and Frozen Lake | Not included | Included |
The Full Pond is a one-time, non-consumable unlock through the App Store, restorable at any time from the paywall or Settings, and it supports Family Sharing.
A quiet pond is waiting for you
Download Petalfin for iPhone and swim your first pond in a minute.