Index Unknown: Logic Puzzles

In-app purchases
Content rating
Everyone
1+
Downloads
Content rating
Everyone
In-Game Purchases
Learn more
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image

About this game

Venture into the unknown. Uncover the logic behind every puzzle.
• 50 individually designed puzzles
• Four difficulty collections with a steep rise in complexity
• Logic, spatial, visual, word, mathematical, and discovery-based challenges
• Little to no instructions
• No ads or time limits
• Playable offline

The first three collections contain 30 puzzles, ranging from approachable experiments to demanding multi-step challenges.
An optional in-app expansion pack unlocks the "Very Hard" collection consisting of 20 puzzles created for experienced solvers. This is not simply another step up. Its deepest challenges may take hours, days, or even longer to unravel.

Look closely. Test your assumptions. Find the rule that was there all along.
50 unique puzzles where discovering the rules is part of the solution.
Updated on
Aug 24, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • No data collected
    Learn more about how developers declare collection
  • Committed to follow the Play Families Policy

What’s new

Improved controls in various places.