64-piece jigsaw puzzles.
A proper evening starter.
Sixty-four pieces in an 8×8 grid — about eighteen minutes. The first count at which the techniques you've learned at 25 and 36 really pay off, and where complex images shine.
About 64-piece puzzles
Sixty-four pieces is the practical floor for a long-session puzzle. The grid is big enough that the picture has room for genuine complexity — backlit skies, intricate facades, fields of similar-shaded foliage — and the techniques you've practised at lower counts (colour sorting, building islands, working from the centre outward) all pay off. Eighteen minutes is the typical time, but a detailed image can stretch to twenty-five.
If 36 starts feeling automatic, 64 is the right next step. It's not twice the work of 36 — closer to one and a half times — because the same techniques carry over. The image has more room to be itself.