# Flippy the Train

> Train track puzzle game simulating digital logic gates and circuits. (iPhone/iPad app by Karl Voskuil.)

- Source: https://appshunter.io/ios/app/flippy-the-train/id957889052 (this page in markdown: same URL + `.md`)
- Developer: [Karl Voskuil](https://appshunter.io/developer/957889051)
- Category: Games, Puzzle
- Price: Free
- Rating: 5.00/5 from 5 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 3 MB
- Languages: American English
- Released: 2015-02-12
- Data updated: 2026-06-09
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/flippy-the-train/id957889052/reviews.md

## What is Flippy the Train?

Build a train track to solve digital circuitry puzzles!

Flippy the Train rides the rails, flipping switches to model basic digital circuitry: NOT, AND, and OR logic gates.

After building these basics, reuse them in larger tracks to create the more-complex XOR gate and half-adder. What is the fewest number of track segments required to build a half-adder?

Includes a sandbox mode for creating arbitrary track for Flippy to ride.

## Key features

- Digital circuitry puzzles
- Logic gate simulation (NOT, AND, OR, XOR)
- Half-adder circuit challenges
- Sandbox mode for track creation
- Minimal track segment challenges

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/flippy-the-train/id957889052/reviews.md

### 5/5 — Wish there were more levels

*2021-04-28*

The logical challenge is real, especially on levels 3 and 4, but then that’s it, unless you redo levels to get a better score…but there is no system for rating one’s score, other than comparison to oneself. In other words, no number of stars, or color of stars, or anything. Very sparse. 

I’m not sure why anyone would use the sandbox mode, although if more challenges were presented, the sandbox mode would be a place to work on them. Because of the sandbox mode, additional logical challenges could easily be added without having to construct new levels.

## Frequently asked questions about Flippy the Train

### What logic gates does Flippy the Train simulate?

Flippy the Train simulates basic digital logic gates including NOT, AND, and OR. It also allows players to construct more complex gates like XOR and half-adders by combining these basic elements.

### Can I play Flippy the Train offline?

The provided information does not specify offline play capabilities. However, as a puzzle and simulation game, it is likely playable without an internet connection.

### What is the gameplay like in Flippy the Train?

Gameplay involves building train tracks to represent digital circuitry. Players must strategically place track segments to activate logic gates and solve puzzles, aiming for efficient solutions with minimal track.

### Does Flippy the Train have ads?

No, Flippy the Train does not contain advertisements. The app is free and does not feature any in-app purchases or ads.

### What devices support Flippy the Train?

Flippy the Train is supported on iPhone, iPad, and iPod devices. It is designed for iOS users.

### How often is Flippy the Train updated?

The latest version of Flippy the Train is 1.7, last updated on December 15, 2025. This indicates recent and ongoing support for the application.

### What is the age rating for Flippy the Train?

Flippy the Train has an age rating of 4+. This suggests it is suitable for young children and features content that is generally appropriate for this age group.

### What is the user sentiment for Flippy the Train?

Flippy the Train has received overwhelmingly positive feedback, with a perfect 5.0-star rating from 5 reviews. This indicates high user satisfaction with the game's concept and execution.

## Version history (last 5 releases)

### 1.7 — 2025-12-15

Updated for App Store age questionnaire.

### 1.6 — 2020-03-31

Use storyboard for launch screen.

### 1.5 — 2020-03-16

Fixed a crash that triggered when restoring deleted sections of track.

### 1.4 — 2017-03-17

Change release build settings to ignore development assertion failures.

### 1.3 — 2016-09-04

Removes a tutorial-related hint from the goals screen when in sandbox mode. Fixes a crash that occurs when trying to force-quit the game.

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## More apps by Karl Voskuil

- [Gargoyles](https://appshunter.io/ios/app/gargoyles/id6450793381)

All apps by Karl Voskuil: https://appshunter.io/developer/957889051

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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 2026-06-09.*