One person is thinking on a word, it can be any word.
They other are trying to guess the word
They can ask 21 question
The person sow make it can think on a new word
It is importent to remember the word you are thinking on, sow it is smart to write it down (but not on this site)
You must also tell something about the word you are thinking on.
Do not make it hard, and do not think about something they only have in your country
it is a something you can eat
Have faith and anything is possible