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Robot secret code: crack the message
Each number stands for a letter. Use the key to decode the robot's message, then type it in to check. Ages 7 to 12. Free, no ads, no sign-up.
The code
The key
How to play
- Pick a level. Trainee uses A=1, B=2 and so on.
- Find each number in the key and write down its letter. A slash shows a new word.
- Type the message and tap Check my answer.
- Detective and Master levels shift the key, just like a real cipher.
What it practices
- Careful, step-by-step thinking
- Working with a key or table
- Patterns: how a shift cipher works
For grown-ups
Secret codes are a sneaky way to practice careful reading and checking. Kids who like this will enjoy making their own key and sending a coded note to a friend. At the Master level, the key changes every time, so they have to read the table instead of remembering it.
More codes, logic grids and a whole mystery are in Robot Brain Puzzles. Try the free two-player maze race too.
Questions
What age is it for?
Ages 7 to 12. Trainee level suits 7- and 8-year-olds; Master is tricky even for adults.
Do I need to type spaces?
No. Spaces and punctuation are ignored when you check.
Is this game free?
Yes. No ads, no sign-up and nothing to download.