Revealing a path one cell at a time: a small UI pattern that makes puzzle solvers teach instead of spoil
Answer sites usually ship a screenshot of the finished solution. That format works for verification and fails at everything else: you cannot see which decision you got wrong, and you cannot unsee the answer if you were only halfway through the puzzle. A path-reveal interface fixes that with a single interaction rule. The grid itself is the answer key, and the reader chooses how much of the key to…
The article discusses a UI pattern called "path-reveal interface" that helps puzzle solvers learn from their mistakes instead of just being given the solution. Traditional answer sites usually show a screenshot of the finished solution, which doesn't help users identify where they went wrong or unsee the answer if they were only halfway through the puzzle.
The path-reveal interface solves this issue by allowing users to unlock cells one at a time, revealing the path as they go. The interface only requires a single integer (how many steps are visible) and a cell index to keep track of the state, making it simple and efficient to implement. The path-reveal interface not only helps users learn from their mistakes but also doubles as an undo feature when they accidentally reveal the wrong cell.
The cost of implementing this pattern is minimal, requiring only a small amount of client-side JavaScript and a CSS grid for mobile devices. The article provides an example of how this pattern is used on LinkedIn's daily Zip puzzle and other games, as well as a free practice mode that generates fresh 6x6 layouts.
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