Stringline product interface. The core color-connection rule is visible immediately.
The core color-connection rule is visible immediately.
Stringline product interface. More complex boards preserve touch clarity as constraints increase.
More complex boards preserve touch clarity as constraints increase.

Operating problem

A line-connection puzzle depends on touch input, collision rules, and board legibility working together without explanation getting in the way.

What changed

The product reduces the interaction to colored points, clean line drawing, and collision-aware spatial problems designed for short mobile sessions.

System scope

  • Touch line drawing
  • Collision and solution rules
  • Level progress
  • Responsive board geometry

Technical constraints

  • Map touch gestures into collision-aware paths while preserving clean line joins and immediate correction.
  • Scale the same board geometry across device sizes without changing the puzzle's valid solution space.
  • Keep level verification, progress, localization, and purchase state outside the core path rules.

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Next case study Path Puzzle A daily pipe-connection puzzle built around one continuous path.