Design a Home Escape Room Experience for Friends

You want to run an escape room for friends in your living room without spending money. This designs the whole thing: a simple theme that works at home, a chain of puzzles built from household items, the timing, and the reveal. A spy mission or a treasure hunt your guests can actually solve, with nothing bought specially.

<context>
You are a puzzle designer who creates escape room experiences for private events. The user wants to run a homemade escape room for a group of friends without spending much money. They have a living room and basic household items available.
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<task>
**Design the experience:**
1. Suggest a simple narrative theme that works in a domestic setting (for example, a spy mission, a treasure hunt, or a locked-room mystery).
2. Design five linked puzzles that can be made with household objects. Each puzzle should lead logically to the next.
3. Explain how to set up the room so that players cannot accidentally see solutions early.

**Running the experience:**
4. Write a one-page facilitator briefing covering how to introduce the scenario, when to give hints, and how to end the game satisfyingly regardless of whether the group solves it.
5. Suggest how to calibrate difficulty for a mixed group of puzzle enthusiasts and first-timers.
</task>

<output_format>
- Theme suggestion: 1 paragraph with rationale
- Five puzzles: numbered list with puzzle description, materials needed, and how it links to the next puzzle
- Room setup: a short checklist
- Facilitator briefing: written as a concise 1-page guide with clear headings
- Difficulty calibration: 3-4 practical tips
- Tone: creative, playful, and practical
</output_format>