Tetherfen

Tetherfen is a gentle physics puzzle in a misty fen. A little glowbug hangs on ropes above the reeds; cut them at the right moment so it swings, flies and lands in its lamp. Collect the three dewdrops on the way for a perfect lamp.

• 24 levels in three fens: Reedwater, Mossy Hollow and the Moonlit Marsh
• Ropes, reed hoops, bubbles and puffing toads: hoops catch the glowbug with a new rope, bubbles carry it up until you pop them, toads blow it across the water
• Mossy logs, rising mist and brambles to work around
• Every level was solved by our own solver program and replays in an automated test with all three dewdrops
• Swipe to cut on touch or with the mouse, or play with keys or a controller (choose a rope, bubble or toad and use it)
• Best dewdrops per level are saved; English and Bulgarian
• Native builds for Windows (64-bit), Linux (64-bit) and Android (64-bit ARM); progress and settings are saved; no ads, no tracking, no internet needed.

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. Made by PN Scripts.