Bunny Sim
Draw rivers with your finger
Paint water across the grass and it becomes a real wall: nothing walks on it, nothing spawns on it, and pathfinding routes around it. Plant bushes for cover, erase water back to land, and save the map to play it again.
Out now on Google Play · iOS on the way
A meadow that runs itself — and sometimes runs away.
Bunny Sim is a free pixel-art ecosystem simulator for mobile: a predator–prey sandbox you shape and then let go of. Draw a river, plant a bush, scatter a few carrots — rabbits forage and panic, foxes hunt and starve, and both species evolve into apex strains if they live long enough.
- Free with ads
- Portrait & landscape
- 8 evolving animals
- Player-drawn maps
The food chain, in eight seconds.
What is Bunny Sim?
Bunny Sim is a sandbox predator–prey simulation you watch more than you play. You shape the land and feed the loop; the animals do the rest. Every run starts from a new seed, so the same meadow never plays out twice — a boom, a crash and a recovery can all happen while you wait for a bus.
| Genre | Ecosystem simulator, predator–prey sandbox, idle simulation game |
|---|---|
| Platform | Mobile — free on Google Play (Android 7.0 and up); an iOS version is in development |
| Price | Free with ads; one optional one-time purchase removes ads forever (no subscription) |
| Controls | Touch only — play in portrait or landscape, with an optional rotation lock |
| Species | 8 animals: 3 rabbit tiers and 3 fox tiers, each ending in two apex strains |
| Progress | Runs start from a fresh seed; drawn maps are saved on the device |
| Online | Optional Google sign-in for a nickname, profile picture and the global leaderboard |
| Art style | Hand-written pixel art, 8-pixel tiles, fixed palette |
| Session length | Anything from one minute to an hour — it is an idle world |
| Developer | Olgun Aldemir · bunnysimapp@gmail.com |
Small rules, loud consequences
Nothing in Bunny Sim is scripted. Every chase you see is the same handful of rules colliding with the map you drew.
Carrots are the whole economy
Rabbits notice carrots inside their perception circle and hurry toward them. Carrots keep sprouting, so the meadow always has a reason to move — and a rabbit that eats enough of them climbs a tier.
Foxes that actually hunt
A fox sees further than a rabbit and turns slower. It wins by ambush and by cornering — and if it goes too long without a catch, it starves. Apex foxes stop to scent the air or follow a trail along the ground.
Three tiers, two apex strains
Eat enough carrots and a rabbit turns golden, sees wider and leaps rivers. Catch enough rabbits and a fox turns deep red. At the top, each species splits into two named apex strains that play completely differently.
A population graph, live
The bottom bar plots rabbits against foxes while you watch. Boom, crash and recovery are visible as they happen, not in a summary screen.
Credits you earn, not buy
Ten carrots eaten gives you one carrot to place. Ten rabbits caught gives you one fox to place. That is the only currency in the game, and it costs nothing.
Field guide: everyone who lives here
Two ladders, eight animals, and one very simple deal: rabbits climb by eating, foxes climb by catching. The same guide lives inside the game under Read more — here it is with the actual pixels.
The prey ladder
Rabbits never starve. Every carrot grows the family, and eating enough carrots evolves the rabbit that found them.
Tier 1
Rabbit
The meadow’s humble starting rabbit. It eats, breeds, and never worries about lunch — only about becoming lunch.
- One kit per carrot
- Flees nearby foxes
- Evolves by eating carrots
Tier 2
Super Prey
After enough carrots the rabbit grows faster and more alert. It can leap rivers and hide whole litters underground.
- Digs litter burrows
- Leaps rivers
- Sees farther
Burrow
- After a carrot it may swap the usual single kit for a whole litter, hidden underground.
- The burrow stays sealed for a while, then releases every kit at once.
- Foxes cannot detect a closed burrow. They walk right over it, none the wiser.
Apex Prey · I
Fluffy
The dark-furred, evasive apex strain. When foxes box it in, it tunnels to safety and resurfaces elsewhere — an emergency exit with ears.
- Tunnels out when pinned
- Hides litters in burrows
- Sharp, frequent jukes
- Built for speed
Escape dig
- It counts itself pinned when at least two nearby foxes keep closing off its best escape.
- If the tunnel is ready the escape fires automatically — there is no dice roll.
- Underground it cannot be seen, scented or targeted, and it resurfaces far from foxes.
- Meeting a Baby Boomer can turn both rabbits into a Super Nest instead.
Apex Prey · II
Baby Boomer
The burgundy apex strain. Fluffy escapes trouble; this one answers shortages with more rabbits. Subtle? No. Effective? Very.
- Breeds when food is scarce
- Builds Super Nests
- Chooses the strongest mate
- Wide, heavy jukes
Baby boom
- It looks for a mate only when there is no carrot anywhere in sight.
- It picks the best partner available: highest tier first, then the closest.
- A lower-tier partner gives a smaller litter of Super Prey — sometimes a Fluffy.
- Spotting a fox cancels the whole romance. Survival is a persuasive argument.
The predator ladder
Foxes live by the hunt. Every catch refills the hunger clock and enough catches bring evolution. Wait too long between meals and the fox starves.
Tier 1
Fox
The basic fox has one job: catch rabbits before its hunger clock runs out. Every successful hunt buys it more time.
- Starves without prey
- Slows through sharp turns
- Evolves by catching rabbits
Tier 2
Super Predator
After enough catches the fox turns deep red: faster, wider-eyed and longer between meals. Continued hunting now produces cubs, too.
- Breeds after catches
- Longer hunger clock
- Sees farther
Apex Predator · I
Zephyr
Hunts by scenting the air. It stops, scans a wide area, then races toward the spot where it caught a rabbit’s scent. Bushes are camouflage, not air fresheners.
- Scents a wide area
- Flushes rabbits from bushes
- Raids Super Nests
- Long hunger clock
Apex Predator · II
Sköll
Hunts by tracking the ground. It follows a visible trail to where a rabbit’s scent was found, then pounces if prey crosses its path. The nose knows; it just works at walking speed.
- Follows ground trails
- Pounces from a trail
- Raids Super Nests
- Named for the chasing wolf
The Super Nest
When a Baby Boomer meets any other Apex Prey, they stop running and build something permanent instead.
- Both parents move inside and leave the roaming population: two apex rabbits become one lasting asset.
- After a short brood the nest releases Fluffy kits again and again, until it is destroyed or the run ends.
- Only an apex fox can raid it. Tier 1 and Tier 2 foxes do not even notice it is there.
- If water or the map edge leaves no room, the meeting becomes an instant litter instead — and two Baby Boomers double it.
The nest raid
An apex fox goes for the nest only when hunting has already failed — live prey always comes first.
- It considers a nest only when its scent search finds no rabbit in range.
- At the nest it searches for five seconds while its hunger clock pauses.
- The raid has a 40% chance to destroy the nest. Otherwise the fox finds nothing and walks away.
- Lower-tier foxes cannot detect a Super Nest at all.
| Animal | Tier | Signature move |
|---|---|---|
| Rabbit | Prey · 1 | One kit per carrot, and a head start on everything |
| Super Prey | Prey · 2 | Leaps rivers and hides litters in sealed burrows |
| Fluffy | Apex Prey · I | Tunnels out of a corner and resurfaces far away |
| Baby Boomer | Apex Prey · II | Breeds through famine and builds Super Nests |
| Fox | Predator · 1 | Races its own hunger clock |
| Super Predator | Predator · 2 | Faster, wider-eyed, and raises cubs |
| Zephyr | Apex Predator · I | Scents the air and flushes rabbits out of bushes |
| Sköll | Apex Predator · II | Follows ground trails and pounces from cover |
How to play
Six steps, no tutorial pop-ups.
- Pick portrait or landscape. The choice sits on the main menu; the meadow is rebuilt to fit the shape you picked.
- Draw the meadow. Cut rivers with the water brush, drop bushes for cover, erase water back to grass — then save the map if you like it.
- Press Start Game. Rabbits, foxes and carrots spawn on grass only — never in the water you drew.
- Watch the balance tip. Rabbits forage and flee, foxes hunt and starve, and the graph at the bottom keeps score.
- Spend your credits. Drop a carrot to save a starving warren, or drop a fox when the rabbits take over.
- Reset for a new seed. Your drawn map stays; everything else starts over.
Privacy, written plainly
Our Privacy Policy explains what each released version may process, why it is needed, and which service providers are involved.
Version-specific disclosure
Data practices are documented for the features and platforms available in each released version.
Purpose and choice
Sign-in, the leaderboard and advertising choices are optional; the policy explains what each one uses before you pick it.
Your controls
You can delete your account and its leaderboard data from inside the game, or ask us about access, correction and deletion.
Read the full Privacy Policy, the Terms & Conditions, or delete your account.
Frequently asked questions
Is Bunny Sim free?
Yes. The whole game is free to play, with advertising between runs. One optional in-app purchase removes advertising permanently — a one-time payment, not a subscription, tied to the Google account you sign in with. Current pricing is shown on the Google Play listing.
Which platforms is it available on?
Bunny Sim is out now on Google Play for phones and tablets running Android 7.0 or newer, and an iOS version is in development. There is no desktop version.
Can I play in landscape?
Yes. Portrait and landscape are both first-class: you pick the orientation on the main menu, and Settings has a rotation lock that keeps the screen the way you turned the phone. Saved maps keep separate shelves for each orientation, because a sideways meadow is a different shape.
How does evolution work?
Each species has three tiers. A rabbit that eats enough carrots becomes Super Prey, then Apex Prey — either Fluffy, which tunnels out when foxes corner it, or Baby Boomer, which answers a food shortage with more rabbits. A fox that catches enough rabbits becomes a deep red Super Predator, then an Apex Predator — either Zephyr, which scents the air and flushes rabbits from bushes, or Sköll, which follows ground trails and pounces. The field guide has all eight.
What is a Super Nest?
When a Baby Boomer meets another Apex Prey rabbit, both parents move inside a nest and leave the roaming population. The nest then releases Fluffy kits again and again until it is destroyed or the run ends. Only an apex fox can find it: the raid takes five seconds and has a 40% chance of destroying the nest.
Can I influence the simulation?
Yes, in two ways. Before a run you draw the land — rivers block movement, bushes hide rabbits. During a run you earn placement credits: ten carrots eaten gives one carrot to place, ten rabbits caught gives one fox to place.
Does it need an internet connection?
The simulation runs on your device, but while advertising is on, starting a run asks for a connection — ads are what pay for the free game. Players who own the ad-free purchase never see that screen. Sign-in and the global leaderboard also need a connection.
Is there a leaderboard or an account?
Signing in with Google is optional. If you do, you can pick a nickname and a profile picture, and your best runs appear on the global leaderboard. You can delete the account and its leaderboard data from inside the game or from the delete-account page.
Does the game save my progress?
Every run starts from a fresh seed, so no two meadows play out the same way. Maps you draw are saved on the device and can be reloaded, your settings are remembered, and the ad-free purchase is tied to your Google account so it restores on a new phone.
What is the age guidance?
Bunny Sim is intended for a general audience aged 13 and over and uses stylized pixel-art predator-prey action. Blood stains from a catch can be switched off in Settings. Review the Google Play listing for the current age rating.
How does Bunny Sim handle personal data?
Data practices vary with the optional features you use, such as sign-in and advertising. Read the current Privacy Policy and the data safety section on Google Play.
How do I contact support?
Write to bunnysimapp@gmail.com. The same address is in the game under Settings — tapping it copies it to your clipboard.