CHALLENGE MODE OF OBSERVATION GAME
The challenge mode is made of 20 tests divided into 4 difficulty levels, 5 per level. The aim is to pass all the tests as fast as possible.
The scoring system goes as follows:
Cookies are used to store your best score and your record time. By reminding you these details you will be able to play against yourself trying to improve such results. Therefore, you have to enable cookies in your browser. If you clear cookies, the information will be lost.
The names of the cookies used are "best_score" and "best_time" and they only store numbers with an expiry date of two years after the last update.
You have passed all tests!
You have beaten your record time!