Buy us a coffee · 请我们喝杯咖啡

The walkthrough is free and stays free. Every board here took a solver, a proof of each rule it uses, and a lot of evenings. If it spared you one, a coffee is the nicest thank-you.
攻略免费，永远免费。每一块板背后是一个推理引擎、每条规则的证明和许多个夜晚。如果它帮你省下了一个，一杯咖啡就是最好的感谢。