Error Message

Snap keeps popping up with this error message "expecting a list but getting a number" when I run the "check for letter block". I tried to replace it with other variables but it didn't work. I have no clue what to do at this point.
here's a link to the project

Hi! Welcome to the forum.

As the error message tells you, the problem is in
Unit 4 Project script pic
The variable GUESS has the user's answer to the prompt. So it's a character string. (Hopefully of length 1.) But the first input to CONTAINS has to be a list!

There's a block that'll do what you want:
Unit 4 Project script pic (1)
in the Strings library.

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