They are web based games and can be reached through the 'Square'.
These are games that successfully combine learning with entertainment.
An example of this is the Crazy Words game where the users, floating through the space, try to shoot the right letters that comprise a given word in a given time. Shooting the right letters mean earning points and shooting the wrong letters means loosing points.
This is a very effective way of teaching spelling and vocabulary. Leaderboards boost competition and engagement and further increase the effect.
You have to work hard, use time wisely and not make mistakes to be and stay in top three.