The fol­low­ing is, sup­pos­ed­ly, a test for com­put­er sci­ence stu­dents in their 2nd year in chi­na. Some solve it with­in min­utes. Oth­ers don’t grasp it even after a week. How long do you take?

Try to block the cat so it can’t escape!

Click the image to go to the game. Then click the fields that you think must be blocked in order for the cat to not escape.

Good luck and have fun!