I received the vehicle and the alphabet sets for my son for Christmas and he absolutely loved them. I came here to see if there were other sets available and was excited when there were insect and animal sets available. I purchased them and received them today and was very disappointed when 2 sudoku sets came in. The original sets were mix and match sets and learning to spell, I don’t think I know any 3 year old who knows how to complete a sudoku. Very disappointed.