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My 3 year old son was given this box of puzzles as a present and he instantly loved it. It's very good for this age as it has 4 varying difficulties of puzzles, so its neither too easy nor too hard as there is a bit of variety. If all of them were 12 pieces it would be finished quickly and not make them think, but its good to have the 12 piece one in there in case they feel frustrated with more pieces, depending on the child's mood.
This box has puzzles with some newer characters in it such as kevin who is seen in the day of the diesels and misty island films, and charlie who is also quite a new character, so they seem quite up to date and appealing. We also had another very similar box which is the one with stepney in, as mentioned by the other reviewer.
The quality of these is good but with some wear and tear I have found the pieces can get broken or bent after a while, and the pieces are quite small so easily lost. I have to keep it out of the way of my younger 2 year old son, as he is mainly responsible for any pieces that have been broken or lost so far. So I would say it's suitable for 3 years+ or closer to 3 but 2 and a half+ may be fine for a more sensible child.
My 3 year old loved these puzzles and because of the Thomas characters he really wanted to do it again and again so it helped him to develop his puzzle skills and become really fast at it, and do them by himself, so I feel like it's quite educational and beneficial. We never had an issue with the 4 puzzles peices being mixed in together (the backs are not marked at all) as even my 2 year old can quickly sort out which pieces belong in which set so that just adds an extra bit to the activity. It's only the box of 10 which we have, where that becomes a bit of a problem. However you could easily mark them or keep in bags if it is an issue.
I would buy more of these with different pictures, so recommended from me.
My daughter is very fond of trains in general, and the Thomas series in particular. She was given this box set for her third birthday, and it was an instant hit as a result.
We do the jigsaws most days, starting with the easiest, 12 pieces, and working through 16 and 20 piece ones to the 24 piece. The first time, she needed a little help but now she just likes to do it herself.
The puzzles themselves are sturdy cardboard, with a good shape. They are easy to fit together and stay put without shifting. You'd expect good quality from an established brand like Ravensburger, and that's exactly what you get.
The pieces of each puzzle are only slightly different in size. I've put them all in separate bags, but we did find it confusing which piece came from which puzzle before I did that. Another suggestion is to write on the back which piece is which, but I prefer the bags as it keeps them separate.
Each picture, however, is unique, with a variety of engines and situations. Each one features Thomas, a universal favourite, but my daughter is a fan of yellow, so she was very pleased that one puzzle shows the yellow engine, Stepney. (Another advantage of including Stepney is that Stepney is a real engine that you can visit if you got to the Bluebell railway in West Sussex.) I'm sure other children have other preferences, so it's nice that they are catered for.
The pictures are very detailed, meaning it's easy to work out how they fit together. They also have good perspective, something which I've noticed my daughter finds difficult to deal with in other puzzles.