Each booklet contains 13 crossword puzzles which cancel with red/green glasses (not included). Both the puzzle grid and the word clues alternate between right and left eyes so you can get some good binocular training. Plus, you could invent other activities such as scanning, saccadics, or filling on "bubble" letters. The pages easily fold out to be inserted into standard non-glare page protectors so they can be used over and over. The answers are provided in the back of the booklet, along with supplemental activity ideas. Sold in 5 packs.