How to play
Islanders: each person is a knight (always tells the truth) or a knave (always lies). Choose a type for everyone, then press ✓ Check. If a choice can’t be right, Check says whose statement doesn’t fit.
Which statements are true? Every statement is either true or false, and some talk about the others. Mark each one True or False so that every statement marked True really is true, and every one marked False really is false.
Mystery number: use the clue about how many statements are true to find the integer. Cross numbers out as you rule them out, then choose your answer.
A good method: suppose something is true, follow what it means, and see whether you reach a contradiction.