Mystery Advent Calendar 2026 for adults Stolen Mona Lisa Heist Case Art-heist whodunit in 24 envelopes · unlock digital evidence, eliminate suspects 14+ solo or team 1025 min

CRACK THE CASE BEFORE CHRISTMAS: The Mona Lisa vanished from a luxury hotel’s private exhibit — and you’re the one who has to find her. Open one sealed envelope a day and follow the trail to a final verdict on the 24th. EACH DAY, A NEW PIECE OF EVIDENCE: A witness letter hides a clue or puzzle — solve it to unlock digital evidence: recordings, photos, hidden-ink messages and more. Eliminate suspects as you go. Solo or team play, ages 14+. CHALLENGING BUT FAIR — NO FRUSTRATION: Every riddle is logically solvable with clean, tested clues, so you keep progressing without dead ends or unsolvable days. Optional step-by-step hints give you a nudge only when you want one. PREMIUM DETECTIVE DESIGN: Beautifully illustrated, high-quality envelopes and case materials give a real investigator feel — from the crime-tape box to the hand-designed clues. Printed on sustainable paper in a keepsake box worth displaying. THE PERFECT MYSTERY GIFT: A memorable alternative to the usual chocolate countdown and an ideal Christmas gift for crime, riddle and escape-room fans. Includes digital case files and optional hints via QR code (internet needed). One-time play.