Basics

How to Play

Each GridCipher puzzle is a classic logic grid: every item in the primary category matches exactly one item in each other category. Use the clues to deduce which pairs are possible.

Controls

  • Click or tap a cell to cycle: blank -> X -> check -> blank.
  • Use arrow keys to move between cells; press space or enter to toggle.
  • Use shift-click, right-click, or delete/backspace to clear a cell instantly.
  • Check marks confirm a match. X eliminates a pairing.

The grid records your deductions: checks are confirmed matches, X marks are eliminations.

Logic shortcuts

Use row and column rules to accelerate

Row logic

When three options in a row are X, the last remaining cell is a check.

Example: If Alice cannot be in three hotels, the last hotel is hers.

Column logic

When three options in a column are X, the remaining cell must be the match.

Example: If only one developer can stay at Harbor Suites, lock it in.

Tips

  • Start with direct clues that fix a relationship immediately.
  • Eliminate impossible options to narrow each row and column.
  • When only one option remains in a row or column, it must be a check mark.