Tell any friend to pick a number from 1 to 31, but not to tell you. Ask your friend in which of the 5 columns is the number he thought of. Once I tell you the columns where the number is, you can guess it.
A demonstration that with AppInventor you can make applications with a very professional appearance.
LANGUAGES: English, Spanish, German, French, Italian, Portuguese, Chinese, Korean, Japanese and Russian.
Intermediate level.
PERMISSIONS: None.
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