Junction Nine

A puzzle backed by math. Spin the grid, connect every line. Every puzzle is verified solvable. But can you find the optimal solve?

Behind Junction Nine is a published mathematical result: in a 3×3 grid where any rectangle can be spun 180 degrees, every arrangement can be returned to order - and never in more than nine spins.

We designed the puzzles and independently calculated the fewest spins each one takes. See if you can match the minimum.

HOW IT WORKS Spin any rectangular section of the grid 180°. Remember - squares count as rectangles. A move can shift several pieces at once, so fixing one connection can disrupt another.

Rotate tiles until every connection lines up. Then keep going: can you match the fewest possible spins?

Every puzzle has a proven minimum.

ORIGIN — FREE Start with Origin, a collection that introduces the mechanic and builds from simple puzzles to genuinely tricky ones.

TRANSFER Unlock a second collection with a new set of puzzles to master.

DESIGNED FOR THINKING

• No ads
• No timers or penalties
• Optional haptic feedback and sound
• Light and dark themes
• More puzzle packs planned

Quick to learn. Surprisingly hard to perfect.