There are 2 classic puzzles in the familiar Ravensburger Quality. Indicated an indication of age of 4+, but that really seems too high to me. Our little daughter (2+) they liked it very much, but in fine motor tasks are more demanding than the framework puzzles of 15-25 parts. Our daughter can solve only if she puts into the puzzle box (each puzzle fits into the finished carton). But from this arises the problem that a puzzle is placed in the lower part and to tilt the other in the top part of the box and then the cardboard can no longer be closed without a puzzle. The backs of the parts of two puzzles are different (in a blue at the other blue with rinds points).
Older children may move to the puzzle easily interpreted so (eg on a table), but for older children (3+) make the puzzle, in my opinion, not enough challenge.
Our Small solves all her puzzles several times a week (great puzzles to solve as a rule once, and then long gone) so that the durability is important. The parts will survive, but the board, with the motifs on top and bottom will hold no more a week (we have the puzzle not even month). Frame puzzles are as much more robust!