Decade-based memory training with an optimal selection of memory exercises from the 50s, 60s, 70s, 80s, and 90s. Created in large print format with five hundred and fifty-five exercises in XXL version. Includes an introduction and explanation of memory training. There are a total of seventeen different puzzles that are built in connection with the mentioned decades. Here is a preview of the content: Word search puzzles, letter jumbles, mental arithmetic, rhyme puzzles, find the errors, sudoku, riddles, continue the pattern series, country puzzles, quizzes, crossword puzzles, morse code, puzzle stories, categorization, paraphrasing, dice completion, cryptogram.