Flippy the Train

Puzzle

Free · Designed for iPad

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.

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Updated for App Store age questionnaire.

The developer, Karl Voskuil, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    • Size
      • 3.2 MB
    • Category
      • Puzzle
    • Compatibility
      Requires iOS 13.0 or later.
      • iPhone
        Requires iOS 13.0 or later.
      • iPad
        Requires iPadOS 13.0 or later.
      • iPod touch
        Requires iOS 13.0 or later.
      • Mac
        Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
      • Apple Vision
        Requires visionOS 1.0 or later.
    • Languages
      • English
    • Age Rating
      4+
    • Provider
      Karl Voskuil
      • Karl Voskuil has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
      • Address
        32 Woodland Rd
        Lexington Massachusetts 02420
        United States
      • Phone Number
        +1 6172978675
      • Email
        karl@hilogames.com
    • Copyright
      • © 2025 Karl Voskuil