Description of game + CREDITS
Quandle is a quantum variant of wordle.
CREDITS:
Game design & coding & UI & background music: Raycosine. The game is also uploaded to my github page: http://raycosine.github.io/Quandle.html
Use SOWPODS as the word list (not all words are English words!!)
Fonts (public domain) & sound effects (under CC0 license) are from the Internet. Detailed info can be found on the index page.

How is your game related to the theme "PATTERNS"?
For an n-letter "word state", there are 3^n possible color codes returned for each "measurement" (guess). Based on the choice of the "measurement basis" and the corresponding color codes, the player is expected to find the "word state" with only a few "measurements". To reduce the sample cost, the player needs to use knowledge about letter frequency / pattern to avoid too many attempts.

How is your game related to quantum physics?
Consider |a>, ..., |z> as the basis "single-character" states. An n-letter "word state" looks like |qubit>, and any state on superposition can be written in the same way as quantum states: |qubit>+|qudit>, |qu>(|b>+|d>)|it>, ...For simplicity, the coefficients are not considered in this game.

The goal of the game is to find the classical description of an n-letter word state on the superposition of k unknown words. For the example above, we need to find out the two words 'qubit' and 'qudit'.

In each guess, the player is asked to choose a word as the measurement basis, and measure a copy of the state: For example, if we choose 'yummy' as the measurement basis, 'y', 'u', 'm', 'm', 'y' will independently measure the five spots, and return a single-shot outcome 'white'(0) or 'green'(1) based on the quantum inner product. To make the game easier, in the actual setting we'll measure each measurement basis character in every spot, and return 'yellow' if any of them returns 'green'.