Creative Dad CompanyCreative Dad Company
TechnologyMathStorytelling

Secret Message Headquarters

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Grades K-230-45 minSource: Creative Dad Company

Kids invent their own code using light, sound, or symbols to send a secret message across the room. It's a fun way to explore communication technology while playing spy headquarters.

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Every level teaches the same core idea — pick the one that fits your time, budget, and energy today.

Prep: 9 minActivity: 35 min1 session~$2/groupOne table or clear floor areaBeginner-friendly

Setup

Gather only common or recycled items needed to build a simple code system, like flashlight blinks or bell patterns, with a key card to decode it. Place the materials beside a simple recording sheet or blank paper, and prepare the Secret Message Headquarters challenge in one working area; no digital device is needed.

Activity

  1. Predict how a message could be sent across the room without talking, using only light or sound.
  2. Build a simple code system, like flashlight blinks or bell patterns, with a key card to decode it.
  3. Send and decode a real message and discover a signal was misread, then refine the code to fix the mix-up.
  4. Present the decoded secret message to headquarters, explaining how the code works.

Done when: The learner completes Secret Message Headquarters after carrying out this core test: Send and decode a real message and discover a signal was misread, then refine the code to fix the mix-up. The learner then uses that result to complete the final task: Present the decoded secret message to headquarters, explaining how the code works.

Materials

Flashlights, bells or a cup-and-string telephone, code key cards, paper and pencils

Shown for the Quick Start version — switch tabs above to see what changes.

Disclosure: Materials links below go to Amazon. As an Amazon Associate, Creative Dad Company earns from qualifying purchases at no extra cost to you.

Steps

  1. Predict how a message could be sent across the room without talking, using only light or sound.
  2. Build a simple code system, like flashlight blinks or bell patterns, with a key card to decode it.
  3. Send and decode a real message and discover a signal was misread, then refine the code to fix the mix-up.
  4. Present the decoded secret message to headquarters, explaining how the code works.

Standards it satisfies

  • NGSS · 1-PS4-4

    Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance.