Prime Number Puzzle: Sokyo

Chain-Reaction Math Brain Game

$1.99 · Designed for iPad. Not verified for macOS.

Tap prime numbers and trigger satisfying chain reactions. Use multiplication and division instincts to clear the board and chase a high score in quick puzzle sessions. Tap a red number. Pop! It splits, chains, and the board clears away — and honestly, it's kind of addictive. Sokyo is a chain puzzle where you tap primes to clear the board. Play a few rounds and you'll get friendly with numbers without even trying. "What divides this?" "2×3 makes 6" — you pick up multiplication and division without it ever feeling like homework. Even if numbers aren't your thing, you'll just be playing a game. ■ Easy to learn Tap a red tile (a prime) and every number it divides in its row and column splits at once. If a split makes a new prime, that one fires too — a chain! The deeper you chain, the more clears at once and the bigger your score. New numbers keep coming every turn. Think a step ahead and see how long you can last before the board fills up. A perfect little brain workout for a spare minute. ■ Great for - A quick mental break - Anyone who loves numbers or puzzles - Getting comfortable with numbers through play (kids too) ■ Features - Simple rules, surprising depth - Gets tougher as you go - Light & Dark - No ads, no in-app purchases, no data collected - Don't know primes? You'll pick them up as you play Tap, chain, and clear them all.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

We improved the App Store listing to make the app easier to find.

Version 1.2

The developer, TOMONOBU HASUMI, 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, for example, based on the features you use or your age. Learn More

    Accessibility

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

    Information

    Seller
    • TOMONOBU HASUMI
    Size
    • 1.1 MB
    Category
    • Puzzle
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English and Japanese
    Age Rating
    4+
    Copyright
    • © 2026 Tomonobu Hasumi
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

    More by TOMONOBU HASUMI