🔩 Lighthouse Screw Fix

<p>Lighthouse Screw Fix hands you a rack of threaded bolts in the lighthouse, each stacked with mismatched coloured nuts, and one beautifully simple rule: only the top nut of a bolt can move, and it will only screw onto an empty bolt or onto a nut of its own colour. Lock three of a colour together and that bolt is done with a satisfying click. It is the puzzle mechanic that conquered 2025-26, and the depth sneaks up on you — every unscrew uncovers what was hidden beneath, and the two spare bolts are your only working room. This is the gentle tier — a four-colour warm-up that teaches the craft. Every level is checked by a solver under exactly the single-nut rule you play with, so a clean solution always exists and a fair turn target is set for three stars. Undo forgives slips, nothing is timed, and it is free and instant in your browser.</p>

How to play

• Tap a bolt to lift its top nut, then tap another bolt to screw the nut on.
• A nut only fits an empty bolt or a nut of the same colour.
• Lock a bolt by stacking three nuts of one colour — locked bolts are done.
• Sort every nut so all bolts are locked or empty to win.
• Beat the turn target for three stars; Undo takes back a move.

Controls

Tap or click a bolt to pick its top nut, then tap the destination bolt. Undo and Restart sit under the rack.

Features

• 6 solver-verified gentle levels in the Lighthouse workshop
• Single-nut moves — the exact rule the solver proved solvable
• Chunky 3D-look hex nuts and threaded bolts, crisp on any screen
• Undo, star targets and a global + daily leaderboard

FAQ