Another interesting one in the style of the Singaporean puzzle that's been making the rounds recently: http://jdh.hamkins.org/transfinite-epistemic-logic-puzzle

Another interesting one in the style of the Singaporean puzzle that's been making the rounds recently: http://jdh.hamkins.org/transfinite-epistemic-logic-puzzle-challenge/ http://jdh.hamkins.org/transfinite-epistemic-logic-puzzle-ch... (knowledge of transfinite ordinals is useful)