I'm probably brain dead but I spent an hour trying to complete that picture slider puzzle but its just way too hard and I don't think its worth the effort trying to solve it
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You can try watching a sliding puzzle tutorial and after that try downloading an app with a sliding puzzle game or look for a site that has it to practice the tricks the video teaches u, like I did
This is the tutorial I watched
It has a link for a site that has a sliding puzzle or if your using a phone try downloading an sliding puzzle app
I used the numpuz app to practice but u can try looking for something different