Connect numbers from 1 to the highest number (e.g., 20) in ascending order by dragging across the grid.
Your path must cover every non-obstacle cell exactly once without crossing itself.
Avoid obstacle cells, which cannot be used.
Use Undo to backtrack one step, Reset to restart, or Hint (3 per puzzle) to highlight the next number.
Pause the timer with Pause if needed.
Complete puzzles quickly to earn achievements like "Speedster" (under 60 seconds), "Hint Master" (no hints), "Perfect Path" (no backtracks), or "Marathon" (large grid).