With exactly 100 mystery puzzles, Brain Games Unsolved Crimes will engage the full battery of your detective skills! This collection includes: crime-themed word searches and crosswords , as well as puzzles in which you examine crime scenes , identify matching fingerprints ​, and much more ! Improve your logic skills , attention to detail , and ability to read between the lines while investigating. Complete answer key found at the back of the book . Spiral bound, 160 pages.