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Mindbender: The smuggler

Every other day, a cyclist rides a bicycle over the border between the border of the US…

Mindbender: equation II

(Variation on another equation question) Remove one short line to make this correct: 5 + 5 +…

Mindbender: Sandtimers

You have two traditional hourglass type egg timers. One takes seven minutes for the sand to run…

Mindbender: Icy escape

You are trapped in the middle of a frozen lake that is so smooth that there is…