INKWAY

INKWAY sets one clean rule for every level: draw a single continuous line connecting every point on the board, without ever crossing back over a path you've already drawn. That single constraint is enough to make later boards genuinely demanding, since a route that looks efficient early on can trap you into a dead end with points still left unconnected. Solving a layout well means thinking a full route ahead before committing your first line, the same forward-planning skill used in single-line tracing puzzles generally. There's nothing else to learn beyond that one constraint — the challenge is pure spatial reasoning, not extra mechanics. It's a good pick if you prefer puzzles that get harder purely through layout design rather than added complexity. Free to play in the browser, no download or account needed to start a level.