Rumis (Blokus 3D) by LaForce vs Feynman diagram

An iOS implementation of the famous board game "Rumis"(also known as Blokus 3D), featuring multi-player via GameCenter and ARKit (on supported devices). Select number of players, map and local / online before you start a new game. You can pinch to zoom in / out. You can browse history using arrow buttons. You can also continue playing at any step in a local game (if your opponent agrees). Rules: 0. Players take turn to place blocks on board within range (white area) and height limit (tap the board to see). 1. The starting player can place a block anywhere. 2. Every other player's first block must touch (share a face with) another block. 3. Each further block placed must touch another block of the same color. 4. Every placed block should not leave a gap underneath. 5. If you cannot place any block, tap the "PASS" button. 6. When you play a block, you get a point. When the game ends, every face of your color visible from above also give you a point. For a more detailed introduction see Wikipedia: https://en.wikipedia.org/wiki/Rumis

This app introduces the symmetry factors in Feynman diagrams. You can get some intuition for the symmetry factors.