Karen puzzles has taught me that single gradient puzzles are pretty easy because you just sort by color. This one was tricky because there were multiple gradients and then the puzzles pieces on top to trip you up. Plus the puzzle image on the pieces didn't match. It was a fun puzzle.
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My wife is a PhD chemist and she showed me you on YouTube and I've watched everything since.
She did her first speed puzzle comp yesterday and her team got 2nd!