Totally stuck at level 9. Maybe that's the point? Totally worth it though. Well done!
Simple Machines (xkcd game jam 2017 entry)
Having trouble? Hints and walkthrough here.
Chrome recommended, but tested on Firefox as well.
In principle it works on mobile, but this is not recommended, because you'll need to be able to click precisely.
Use this tool if you want to see which words this includes.
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What a curious and cool game!
I played until I finished level 7, which was extremely hard for me. Spoiler: it wasn't clear to me that I had to return the spring AFTER making all the instructions; perhaps using the word ALL would help? Even on easy, I had a bit of trouble.