Crosswords. A set of 6 books

A series with crosswords is represented by six books with different levels of complexity:
1st level,
level 2,
3rd level,
"study the world",
"Rebuses and puzzles",
"record holders".
Solutions of crosswords are an excellent memory training and an effective technique for building vocabulary in children.
The mental development of the child is the necessary part of the upbringing of a versatile personality. Crosswords can be compared with study, but, unlike it, children more perceive the solution to the puzzle as a game.
All crosswords in the book are thematic, there are not only the usual crosswords in the classical performance, but also:
mathematical,
pinkishment of ciphers,
Japanese crosswords - Sudoku,
alphabetical,
Crosswords-ribs.
The book has a large format, bright illustrations that the child will like, and tasks will allow you to expand the horizons.
Recommended for children from 6 years old