Mtatt100, a great riddler and a good friend has passed away :(

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A few years ago I (small-tool) made a riddle for his birthday.

It feels appropriate to play the last level of that riddle here in memory of him.

here it goes:

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The LAST  level is not...

- Very hard for a real riddler.
- About difficult tricks to do.
- A reason at all to panic.
- A level to get stuck.
- With difficult things with Google.
- Using maths or things like that.
- Trying to use vague ciphers.
- A very tricky Sudoku.
- A sneaky braintwister.
- Rotting and counting.
- Binary, braille or morse.
- An upside down calculator.
- Even about our dear granny.

... But ?