You insert a text, then it guesses a random character, ranging from for example [a], [b] and [c], to [.], [?], [!] and [,]. If you use any other characters, which are not the 26 letters of the Latin alphabet, or the period, question mark, exclamation mark, comma, astrophe or double quotation mark, it will infinitely try to guess the character you inserted, which is not in the index. Scratch is not case-sensitive, so it can't detect capital letters, sorry! Index: 0. [space] 1. a 2. b 3. c [...] 24. x 25. y 26. z 27. . 28. ? 29. ! 30. : 31. , 32. ' 33. "