Feynman rules vs Squarelink

This app introduces Feynman rules. You can get some understanding for Feynman diagrams. E is external point, V is vertex, P is propagator, and S is symmetry factor.

Dominoes, but four-sided: every tile is a square with four numbers, and there's exactly one right spot for it on the board. In Squarelink, every tile is a square domino with four numbered sides. Look at its neighbors, try a rotation, and find the connection that makes everything fit. One simple rule, thoughtful choices, and the satisfaction of a perfect fit. FOUR SIDES. ONE SIMPLE RULE. Drag a tile onto the board and rotate it to connect matching numbers. Every touching side must match. Connect more sides in a single move to earn more points. FIND YOUR WAY TO PLAY • Travel: explore 100 levels with placement, score, and streak goals, plus stars to collect. • Infinite: build out your board and try to beat your best score. • Daily Challenge: the same board for everyone, two minutes, and one scored attempt each day. • Duel: take on the green square in a game against a computer-controlled opponent. GET THE HANG OF IT A playable introduction guides you through your first placements and rotations. Hints help you spot a way forward, while joker tiles open up new possibilities. MAKE IT YOURS Discover themes and tile styles to unlock as you progress. Enjoy pastel colors, tactile feedback, and animations that celebrate your perfect fits. Available on iPhone and iPad, in English and French. Includes ads and in-app purchases. The introductory puzzles are protected from ads. Turn your first tile. Find your first connection.