Loopmarsh: Loop Logic Puzzle

A loop-drawing logic puzzle in a night marsh: draw one closed loop so each number counts its sides. 40 puzzles proven to have one solution, a daily marsh and hints that explain each deduction. Free, no ads, no tracking; tap, drag or keyboard.

Fireflies drift over a dark marsh and the stepping stones are numbered. Draw one closed loop along the edges between the stones so that every number counts exactly how many of its four sides the loop uses. The loop never branches and never crosses itself.

Every puzzle was generated and then solved by sound deductions alone, which proves it has exactly one solution. When you are stuck, the hint does one step and tells you the rule: a full number, a dot that already has two lines, a dead end, an early loop, or a short what-if that breaks.

• 40 puzzles: from 5x5 to 10x10, rated Gentle, Tricky or Deep
• Daily marsh: an 8x8 puzzle generated from today's date
• Hints that teach: each hint applies one deduction and explains why it is forced, or removes a wrong mark
• Auto-complete: off, X marks only, or lines and X marks; undo takes a whole step back
• Draw your way: tap edges, drag across dots, or move a keyboard cursor and draw with the arrows
• Saved progress: solved puzzles, hint-free solves and best times are kept in the browser
• English or Bulgarian: the whole game, hints and rules included, follows the browser language

Code and text written with AI assistance; checked by PN Scripts with automated tests. Every shape is drawn and every sound synthesised by code; there are no AI-generated image or audio files.

Controls

• Tap or click an edge: line, then X, then clear
• Drag across the dots: draw or erase a run of lines
• Arrow keys: draw from the cursor ring with the current pen
• Space / Enter: switch pen (line, cross, move); X: cross pen
• Z: undo, H: hint, A: auto-complete, L: puzzle list, R: clear, I: rules
• P / Esc: pause, M: sound

Made by PN Scripts.