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Re:Factorio 1.0 by raxxorrax on Friday August 14, 2020 @08:24AM (#24156954)
You can quickly ruin some hours of programmers if you post the wrong link.

https://regexcrossword.com/

Re:Factorio 1.0 by DCoder on Friday August 14, 2020 @10:32AM (#24158421)
And if you thought that was not challenging enough:

https://rampion.github.io/RegHex/