# The Ethanol Challenge

> The Ethanol Challenge (iPhone/iPad app by Kerry Greathouse.)

- Source: https://appshunter.io/ios/app/the-ethanol-challenge/id1532435580 (this page in markdown: same URL + `.md`)
- Developer: [Kerry Greathouse](https://appshunter.io/developer/1532435582)
- Category: Education, Games, Casual, Simulation
- Price: Free
- Age rating: 9+
- Requires: iOS 8.0 · 53 MB
- Languages: American English
- Released: 2020-09-19
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/the-ethanol-challenge/id1532435580/reviews.md

## What is The Ethanol Challenge?

Join the Novozymes team, lead by your superhero, Alphie (the alpha-amylase) through an adventure in ethanol production.  Together with his friends, Alphie turns corn into ethanol by chomping down as much starch as possible, converting the starches and dextrins to sugar and then devouring all the sugars and producing ethanol and carbon dioxide.  Careful though, you have to masterfully control your pH and temperature and avoid doughballs, fusels and bacteria or your yields will suffer!  Challenge yourself as production conditions become more challenging  - can you get the same yields in the Spring Time as during Summer Heat?


## Version history (last 3 releases)

### 3.2 — 2020-12-22

Updated instructions screens.
Added new link to Novozymes Bioenergy University LinkedIn Page.

### 3.1 — 2020-12-14

This version has a new player interface.
The virtual joystick has been removed, and players can now control their enzyme characters by touch and moving their finger around the screen.

### 3.0 — 2020-09-19

No release notes.

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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 2026-05-19.*