Very Easy — logic-grid deduction puzzle
Hugh, Opal, Horace and Nell got in an early warm-up before the rest of the village choir arrived.
The rest of the village choir wasn't due for a while, so Hugh, Opal, Horace and Nell came early to warm up. Four music folders sat waiting on the piano, each a different color. Every singer picked up one folder and stepped onto a riser of their own while the conductor hunted for the opening note. The risers counted up from the lowest, so the first riser was the bottom one and the fourth was the top.
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