GMS sends out a monthly puzzle that is NEVER as straightforward as I think, and usually takes me a couple of days and more than one "aha!" moment to complete. I love how creative the various parts to these puzzles are, everything from a cassette tape to a coffee mug to mysterious phone numbers with cryptic answering machine messages. It's so much fun to have physical clues to manipulate, and that sets this puzzle subscription apart. I gave GMS as a gift to my daughters (and their husbands/partners), a friend and his wife, and my brother and his 14 year old son. All of them have had a blast working on it together and found it, as I have, interactive, challenging, a great bonding activity, and so much fun! If you're looking for a deviously clever monthly diversion, don't look any further -- GMS is the puzzle box you want! And it’s the perfect gift for that hard to buy for know-it-all-teen, game-loving Millennial, family gamenight aficionado, or sharp Baby Boomer.