# Critters1 Biodiversity

> Simulation game to maintain island biome biodiversity through predator-prey dynamics. (iPhone/iPad app by Richard Loda.)

- Source: https://appshunter.io/ios/app/critters1-biodiversity/id1544004520 (this page in markdown: same URL + `.md`)
- Developer: [Richard Loda](https://appshunter.io/developer/1291794366)
- Category: Games, Education
- Price: $0.99
- Rating: 5.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.1 · 9 MB
- Languages: American English
- Released: 2020-12-09
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/critters1-biodiversity/id1544004520/reviews.md

## What is Critters1 Biodiversity?

Be a benevolent God or Goddess! In this app you lend a helpful hand to keep your island biome in dynamic equilibrium and learn a little about the need for biodiversity. Your simple goal is to keep the game running for as long as possible by occasionally launching (red) prey and (purple) predator species. They each live a random lifespan and if they have sufficient energy they will give birth to their own kind within a fertile period. Reds graze, and Purples eat Reds for energy, if they can catch them. Predators will move to hunt the prey, who attempt to flee. The prey tend to flock together and the predators hunt in packs. Species live on a Wrap World where the left and right sides of the screen connect, as do the top and bottom. Prey gain energy by grazing, but if there are too many prey there is competition for food, overgrazing and nutritional loss, which makes them work harder to stay alive. If predator numbers are too high, they must also compete for prey making life harder.

When species individuals get too old, they die. If species individuals are too young, old, or don’t have enough energy to give birth, the species dies out and goes extinct. If the predators can’t catch and kill the prey, they also lose energy and eventually die.

Your goal is to keep the world in dynamic equilibrium for as long as possible. The score is affected by time, launches, and number of individuals. Each game is unique and random, except for your God-like input. Be mesmerized observing your island universe from on high, trying to to keep it in dynamic equilibrium, and rooting for your favorite individuals. The app is simple enough for a child to easily use, but complex enough for adult geeks to analyze the resulting data.

INSTRUCTIONS:
Load app, two individuals initiate the game. Start launching additional individuals of each species. 
Reset button stops the game and resets high score (HS:).
Touch screen anywhere in empty area to restart a stopped Game.
Keep track of your (high) scores (until reset).
Press Graph button to observe individual counts as a function of time (in real-time).
Graph mode allows examination of whether deaths occurred from old age, low-energy, or kills.
Double tap gesture changes the origin of  the graph, pan moves the graph.
Pinch gesture at greater than 45 degrees scales the Y axis, and at less than 45 degrees scales the X axis (independently).

USAGE TIPS:
Both species live a random lifespan (100 - 160 seconds). 
The fertile period is 30 - 90 seconds.
The species lose energy as a function of time as they move.
Real-time screen labels include Launches (L:), Current Count (C:), time (t:), Score (S:), average Age (A), average Energy (E:).
If you dislike your graph adjustments, toggling the Back/Graph button resets the graph to original settings.
Do not run game and leave it in Graph mode or death statistics may not update.
Graph begins roll mode at 2,000 points (seconds).
Game can become unstable if frames per second (fps) starts to go below 30.

## Key features

- Introduce prey and predator species
- Manage island biome equilibrium
- Observe species lifecycles and interactions
- Real-time graphing of population dynamics
- Adjust graph axes and origin
- Learn about biodiversity

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/critters1-biodiversity/id1544004520/reviews.md

### 5/5 — Not easy being a god

*2021-03-26, version 1.3*

You have to pay attention, or everybody dies! And it’s your fault.

### 5/5 — Have fun being a god.

*2020-12-29, version 1.0*

Interesting that the graph plot mirrors predator-prey dynamics in this seemingly simple game. Fun watching these critters work to survive.

## Frequently asked questions about Critters1 Biodiversity

### What is Critters1 Biodiversity?

Critters1 Biodiversity is a simulation game where you manage an island biome by introducing prey and predator species to maintain a dynamic equilibrium. You learn about biodiversity and ecosystem management.

### How do I play Critters1 Biodiversity?

Load the app and launch individuals of the red prey and purple predator species. Your goal is to keep the game running for as long as possible by balancing their populations and lifecycles.

### What are the gameplay mechanics in Critters1 Biodiversity?

You introduce species, observe their random lifespans and fertile periods, and manage their energy levels. Prey graze and flock, while predators hunt them. The game features a Wrap World where screen edges connect.

### Can I play Critters1 Biodiversity offline?

The provided data does not specify offline play capabilities. However, simulation games of this nature often function without a constant internet connection.

### What is the price of Critters1 Biodiversity?

Critters1 Biodiversity is priced at $0.99. This is a one-time purchase for the application.

### What devices does Critters1 Biodiversity support?

Critters1 Biodiversity is supported on iPhone and iPod devices. It is rated for ages 4 and up.

### How often is Critters1 Biodiversity updated?

The latest version of Critters1 Biodiversity is 1.3, last updated on March 25, 2021. Update frequency information is not detailed in the provided data.

### Does Critters1 Biodiversity have ads?

The provided data indicates that Critters1 Biodiversity does not have advertisements. The monetization model is a one-time purchase.

## Version history (last 4 releases)

### 1.3 — 2021-03-25

Added sound effects for births, deaths, and kills.

### 1.2 — 2021-03-24

Fixed a bug which sporadically caused all sprites to disappear from the screen.

### 1.1 — 2021-03-20

Fixed a bug in graphics routine.

### 1.0 — 2020-12-09

No release notes.

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## More apps by Richard Loda

- [PiSwift](https://appshunter.io/ios/app/piswift/id1291794367)
- [Atmospheric Model](https://appshunter.io/ios/app/atmospheric-model/id1299565883)
- [dicetest2](https://appshunter.io/ios/app/dicetest2/id1558577875)
- [Stratsheet](https://appshunter.io/ios/app/stratsheet/id6473089184)

All apps by Richard Loda: https://appshunter.io/developer/1291794366

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*