Its only a short game if you give up! The point of it is to keep going and to get faster and faster at answering the questions. I mean its no Zelda obviously, it more of a daily mind workout, like doing a sudoku every lunch or something. You could play on it for an hour and play 100 different rounds, whereas say Zelda, an hour would only be 1 go...
Definitely try and get it cheap though!! It always sucks getting games at full price!