There are six puzzles in this series. They are all of different colours corresponding to the difficulty. This much is stated but only the 2 "extreme" colours are mentioned. There is no proper information, nor any suggestion how you could order one specific colour, a selection or all of them, until you elect to buy. All six would cost £10.50 postage - similarly no mention is made of aggregated postage. Tobar, the makers have gone to the wall recently. You might get them for under £5 then from someone who really wants to sell them.