Screw Puzzle: Nut & Bolt Sort

🔩 A nuts and bolts game on a wooden board

Screw Puzzle: Nut & Bolt Sort is a nuts and bolts game, the kind also called a wood screw puzzle or screw pin puzzle. Coloured bars lie across a wooden board, crossed and woven over each other, and every bar is pinned down by screws. There are only a few empty holes. Move the screws into them one by one, and a bar drops off the board the moment nothing holds it. Clear every bar to win the level.

It is a slow, logical puzzle rather than a reflex game. There is no timer, so you can study the board for as long as you like before the first move.

🎮 How to play

• Tap a screw, then an empty hole. The screw comes out and goes into the hole you picked.
• A bar falls when it is free. Once the last screw holding a bar is gone, the bar drops off the board, and the holes it covered open up.
• Mind the layers. Bars lie on top of each other. A bar underneath can't fall while a bar above still pins it down, even after its own screws are out.
• Clear the board to win. When every bar has dropped, the level is done.

🧰 Tools for stuck boards

When you run out of moves, tools help: the hammer knocks screws loose, and you can open an extra hole when the free ones are all used. More tools and coins come from the daily lucky spin.

✨ What's in the game

• 3,000+ levels, from a few crossed bars to dense woven boards
• Free to play: every level and feature is available without paying
• Offline play, so it works on a plane or with no signal
• Daily gifts and a free lucky spin every day
• Cute characters to unlock
• No timer, no rush

💡 Tips for harder levels

1. Start with the top bar. Look for the bar that sits above all the others. Freeing it opens up the board fastest.
2. Count the screws before you move. A bar with one screw left is one move from falling. A bar with four screws needs four free holes, so leave it for later.
3. Use the holes a falling bar leaves behind. Every dropped bar uncovers holes. Plan your next moves around the holes you are about to get, not just the ones open now.
4. Never fill your last empty hole without a reason. If that move doesn't drop a bar, you have nowhere left to put the next screw.
5. Save the hammer for real dead ends. When a board is truly stuck, one knocked-out screw is often enough to start a chain of falling bars.

For a step-by-step method, read our screw puzzle strategy guide.

❓ Questions players ask

Is Screw Puzzle free? Yes. Every level and feature is free to play.

Does it work offline? Yes. You can play without an internet connection.

How many levels are there? More than 3,000, and they get harder as the boards get denser.

Is this a nut sort game? Not quite. In a nut sort game you stack coloured nuts onto bolts by colour. Here you unpin coloured bars from a wooden board, so it plays more like a wood nuts and bolts puzzle.

Where can I download it? Screw Puzzle: Nut & Bolt Sort is on Google Play.

🧩 More puzzles to try

If you like slow, logical puzzles, Water Sort Puzzle: Liquid Sort asks you to pour coloured water until each bottle holds one colour, and Dog Sort: Puppy Puzzle groups puppies by breed. See more on the brain training games page.

Download Screw Puzzle: Nut & Bolt Sort and start unscrewing.