Method for measuring usability

20 random countries have been removed from the map of the world! Can you identify them in 3 minutes?

Click on the first names of first ladies of the United States. But three wrong guesses ends the quiz.

Drag the flag onto the correct state. Careful, though! One wrong move and the game ends.

You will be shown 10 random numbers between 1 and 100 without knowing what's next. Your task is to put them in order! But beware, if a number cannot be placed, the quiz ends...