Mystery envelope challenge

A cooperative envelope trail ends in one shared reveal. Use large paper clues and make sure everyone has a role.

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• For the party planAmazon Basics A9 envelopes, 100-pack on Amazon (paid link)

  Quantity: Use 6–12 clue envelopes plus a reveal; a 100-pack leaves a surplus.

  Existing envelopes are preferable if you only need one party’s clues.

  Before you buy: Much more than one party needs. Use ordinary envelopes you own first; do not seal in small loose objects.

• For the party planCrayola construction paper, two-pack on Amazon (paid link)

  Quantity: Use 24–36 sheets from one two-pack, or your existing paper.

  Use 12 detective sheets plus large clue cards.

  Before you buy: Manufacturer minimum age 3. Adults prepare toddler decorations. Paper is not food-contact wrapping; use child-safe cutting tools with supervision.

• For the party planCrayola washable markers on Amazon (paid link)

  Quantity: One 40-marker box split into three shared trays.

  Three shared trays for clue notes, maps and detective IDs.

  Before you buy: Ages 3+. Work on ordinary paper. Protect the craft surface and recap after use; some feedback mentions drying.

• Optional extraAvery removable name badges, 100-pack on Amazon (paid link)

  Quantity: Use 12 labels plus a few adult IDs from a 100-pack.

  Optional agent IDs; offer handwritten paper cards instead.

  Before you buy: Not skin stickers. Avoid delicate fabrics; give guests a paper-card alternative. Keep backing scraps away from food.

Bring from home or buy locally: Pre-written clues tested by another adult · A cardboard case-file box and pencils already owned · Meal/cake tableware, cups, napkins and utensils · Equal detective certificates; no locked rooms or blindfolds needed · Cake or other birthday treat, allergy-checked snacks and drinks · Adult food and settings counted separately