Wordle over DNS
Each DNS query submits a Wordle-style guess and the answer reports game state, expressing an interactive loop in short DNS messages.
This service adapts Wordle to DNS. Each query represents a guess, and the DNS response reports the game state.
It proves that a modern web-game format can work with a resolver and a terminal, provided the rules are expressed as short text.
Primary source: https://dgl.cx/2022/02/wordle-over-dns