Here’s an old puzzle. It’s from the Kodacolor collection, with teal colored backsides. The pieces are very uniform- I don’t think there’s a single piece in this puzzle that doesn’t have two bumps and two holes (aside from the edges of course), so putting it together is all a matter of matching colors. The pieces are too small to easily visualize slight differences in shape. Surprisingly, I enjoyed this one- the foliage is a challenge. And my kids were all into it just because the kittens are cute!
I didn’t make an effort to challenge myself on this one, but just started with the areas of greatest contrast or interest, and worked from there.