Almost every online jigsaw asks you one question before it starts, and most people answer it without thinking: how many pieces? It is the single most consequential setting in the format and it is worth understanding.
The count, not the picture, sets the length
The same image at 48 pieces and at 240 is two completely different activities. The first is five minutes; the second is most of an hour. Choosing a picture you like and then accepting whatever count is offered is how people end up abandoning boards halfway.
Difficulty does not rise linearly either. Doubling the count roughly triples the sorting work, because every piece has to be compared against a larger field before it finds its place.
What the picture actually changes
The image affects difficulty, but through one property: how much of it is uniform. A landscape with a large sky is harder than a busy market scene at the same count, because a third of the pieces carry no usable information.
Photographs are harder than illustrations for the same reason. Drawings have hard outlines and flat colour; photographs have gradients, and a gradient is a slow way to sort.
A practical rule
For a short break, take between 40 and 60 pieces of an illustrated image. For an hour with something on in the background, take 150 to 250 of a photograph. If you want to be genuinely challenged rather than merely occupied, take a photograph with a large uniform area and a high count — that combination is where the format stops being relaxing.
Start with the frame, then the texture
Whatever count you choose, the method is the same: edges first, then sort the interior by texture rather than colour. Colour sorting works on illustrated images and fails on photographs, where three different objects share one hue and differ only in pattern.
Leave uniform areas — sky, snow, water, grass — until last. Those pieces are placed by shape, and shape is far easier to judge from a small remaining pile than from a full table.
