CASE ZERO
Case 173

Who is guilty?

Exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.

Sofia: “None of Sofia, Max or Lily is guilty.”
Max: “Neither Sofia nor Ezra is guilty.”
Lily: “The guilty person is one of Max, Ezra or Cleo.”
Ezra: “Sofia is innocent.”
Cleo: “The guilty person is either Max or Lily.”
Random case
Solution: Cleo is guilty. Testing each possible culprit leaves this as the only assignment where the culprit's statement is false and all four innocent statements are true.