Medium — logic-grid deduction puzzle
Five friends each bowled on a lane of their own with a ball of a different colour, and one of Tommy's three desk notes was wrong.
The bowling alley on Maple Avenue had been open for just a month, and the whole town wanted a go. On Friday night, Dora, Frank, Lena, Walter and Iris came in together. Each friend took a lane of their own and picked a ball from the rack, and no two balls were the same colour. Tommy, the boy at the front desk, was meant to write down who bowled where. Between rings of the till, Tommy scribbled three quick desk notes, and one of them came out wrong. The owner needed the record put right before the names went up on the trophy board.
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