Make a Secret Spy Code with AI

Use AI to invent a secret code only you and a friend know.

5 min · Reviewed 2026

The big idea

Use AI to invent a secret code only you and a friend know. You bring the imagination — AI is your idea-buddy. The best part is choosing what to keep, what to swap, and what to make your own. AI is fast at giving you lots of starter ideas, but the taste, the personality, and the final choices come from you. That's what makes the project feel like yours.

Working on a secret spy code project teaches a useful skill: how to ask for help and then judge what you get. Real artists, designers, and writers do this all the time — they brainstorm, they get feedback, then they pick the best parts. Using AI is a kid-sized version of that same process.

How secret spy code projects actually work

A spy code maps each letter to a different symbol or letter.
A 'cipher' is the rule that turns plain text into code.
Sharing your code with one friend lets only you two read messages.

Here's a concrete example: imagine a simple letter-to-symbol code for sending notes. With a clear idea like that, you can ask AI for help and get back something you can actually use. Vague prompts like 'make something cool' usually give vague answers. Specific prompts with details — a topic, a length, a tone — give you something you can actually work with.

Prompts to try

'Help me invent a simple alphabet code where A=1, B=2…'
'Suggest 3 funny code names for objects in my room.'
'Write a 3-letter coded message I can decode.'
'Make sure the code is easy enough for a friend to learn.'

Notice how each prompt has a clear ask: a topic, a number, a style, and sometimes a rule like 'kid-friendly.' Stacking those details together is a trick that gets you better answers.

Cipher vs. code

A cipher swaps each letter for another (A→Z, B→Y…). A code swaps whole words. Both are fun for kid spies — try one, then try the other.

Try it!

Pick a code style (letters→numbers, letters→symbols).
Ask AI to write a key.
Send a friend a coded note and a copy of the key.

If you don't love the first answer, ask again. AI is happy to give you three more options. Picking your favorite is part of the fun, and swapping out one piece while keeping another is totally allowed. Mix, match, and remix until it feels right.

When you're done, share your work with someone who'll appreciate it — a parent, a sibling, a friend, a teacher. Sharing finishes the project and turns a private idea into something real. Plus, hearing what other people think gives you ideas for next time.

End-of-lesson check

15 questions · take it digitally for instant feedback at tendril.neural-forge.io/learn/quiz/end-explorers-creative-AI-and-secret-spy-codes

What is a 'cipher'?
1. A rule that turns text into code
2. A type of dance
3. A snack
4. A pet
Why share the key with your friend?
1. To break the code
2. So they can decode your messages
3. To lose it
4. Because AI requires it
What does the rule say about secrets from grown-ups?
1. Always hide everything
2. Tell no one
3. Don't use codes to keep things from safe adults
4. Burn the key
Which is the simplest code?
1. Random gibberish with no rule
2. A 100-step rule
3. Code that changes daily
4. A=1, B=2, C=3 (letters to numbers)
Best AI prompt?
1. Code
2. Make a simple A=1, B=2 alphabet code with a key
3. Hi
4. Help
If a code is too hard, your friend will:
1. Struggle to decode
2. Solve it instantly
3. Refuse forever
4. Memorize it overnight
Which is a 'word code'?
1. Swapping letters
2. Adding emojis
3. Erasing letters
4. Replacing whole words with code names
Why use a code with a friend?
1. To start a real spy agency
2. To avoid teachers in mean ways
3. Fun, shared inside-joke notes
4. To break rules
What is the human's job?
1. Wait for AI to text your friend
2. Do nothing
3. Pick the code style and write notes
4. Sleep
If AI's code is confusing, you can:
1. Use it anyway
2. Quit
3. Cry
4. Ask for a simpler version
Which is NOT part of a code system?
1. Tax return
2. Key
3. Cipher rule
4. Coded message
Why is sharing the KEY so important?
1. It's the law
2. Without it, the message can't be decoded
3. AI requires it
4. For no reason
'Decode' means:
1. Add more code
2. Burn the message
3. Translate to French
4. Turn coded message back into plain text
Best place to keep your key?
1. Posted publicly online
2. Lost on the bus
3. With your friend who shares the code
4. On the news
Best way to test the code?
1. Hide it forever
2. Send a short coded note to your friend
3. Forget about it
4. Burn it

← Back to interactive lesson

Tendril · Explorers · Creative AI

Make a Secret Spy Code with AI

Use AI to invent a secret code only you and a friend know.

5 min · Reviewed 2026

The big idea

How secret spy code projects actually work

A spy code maps each letter to a different symbol or letter.
A 'cipher' is the rule that turns plain text into code.
Sharing your code with one friend lets only you two read messages.

Prompts to try

'Help me invent a simple alphabet code where A=1, B=2…'
'Suggest 3 funny code names for objects in my room.'
'Write a 3-letter coded message I can decode.'
'Make sure the code is easy enough for a friend to learn.'

Notice how each prompt has a clear ask: a topic, a number, a style, and sometimes a rule like 'kid-friendly.' Stacking those details together is a trick that gets you better answers.

Cipher vs. code

A cipher swaps each letter for another (A→Z, B→Y…). A code swaps whole words. Both are fun for kid spies — try one, then try the other.

Try it!

Pick a code style (letters→numbers, letters→symbols).
Ask AI to write a key.
Send a friend a coded note and a copy of the key.

End-of-lesson check

15 questions · take it digitally for instant feedback at tendril.neural-forge.io/learn/quiz/end-explorers-creative-AI-and-secret-spy-codes

What is a 'cipher'?
1. A rule that turns text into code
2. A type of dance
3. A snack
4. A pet
Why share the key with your friend?
1. To break the code
2. So they can decode your messages
3. To lose it
4. Because AI requires it
What does the rule say about secrets from grown-ups?
1. Always hide everything
2. Tell no one
3. Don't use codes to keep things from safe adults
4. Burn the key
Which is the simplest code?
1. Random gibberish with no rule
2. A 100-step rule
3. Code that changes daily
4. A=1, B=2, C=3 (letters to numbers)
Best AI prompt?
1. Code
2. Make a simple A=1, B=2 alphabet code with a key
3. Hi
4. Help
If a code is too hard, your friend will:
1. Struggle to decode
2. Solve it instantly
3. Refuse forever
4. Memorize it overnight
Which is a 'word code'?
1. Swapping letters
2. Adding emojis
3. Erasing letters
4. Replacing whole words with code names
Why use a code with a friend?
1. To start a real spy agency
2. To avoid teachers in mean ways
3. Fun, shared inside-joke notes
4. To break rules
What is the human's job?
1. Wait for AI to text your friend
2. Do nothing
3. Pick the code style and write notes
4. Sleep
If AI's code is confusing, you can:
1. Use it anyway
2. Quit
3. Cry
4. Ask for a simpler version
Which is NOT part of a code system?
1. Tax return
2. Key
3. Cipher rule
4. Coded message
Why is sharing the KEY so important?
1. It's the law
2. Without it, the message can't be decoded
3. AI requires it
4. For no reason
'Decode' means:
1. Add more code
2. Burn the message
3. Translate to French
4. Turn coded message back into plain text
Best place to keep your key?
1. Posted publicly online
2. Lost on the bus
3. With your friend who shares the code
4. On the news
Best way to test the code?
1. Hide it forever
2. Send a short coded note to your friend
3. Forget about it
4. Burn it

← Back to interactive lesson