Medium — logic-grid deduction puzzle
Four inspectors arrive one by one at the old foundry gate, each with a badge and a snack, and the gatekeeper's notes must sort out who was who.
Before the morning shift, Grace, Oliver, Henry and Lucy came to the old foundry gate for the inspection, one after another. Each wore a badge pinned to their coat and carried a little snack for the long day ahead. The gatekeeper wrote every arrival in the ledger. But in all the bustle the badges and snacks got muddled, and now only a few notes are left to set things straight.
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