Medium — logic-grid deduction puzzle
Catherine, Miles, Tamsin and Wesley must sort out their mixed-up count sheets before they leave the reserve.
At first light, Catherine, Miles, Tamsin and Wesley each crept into a wooden hide beside the water to count birds. The hides stood one after another along the path, each a little farther from the entrance than the one before. Each watcher kept an eye on one kind of bird and wrote down a peak tally, the most of that bird they saw at one time. When the mist began to lift, the four met at the reserve office and laid their count sheets on a folding map board. Then a sudden gust swept the name cards off the sheets and mixed them all up. The notes could still be read, so the four set about working out whose sheet was whose.
Read the clues, rule out what cannot be, and prove what must be. Every GRIDIGMA puzzle is verified by a solver that shows the reasoning behind each step, so a solution is never a guess.
Logic grid puzzles: how to solve them, with a worked example