The slow thinking trainer helps you training the slow thinking part of your brain. The slow thinking part is responsible for all tasks that require your full attention like solving math equations, working on a complicated puzzle or learning a lot of material in your class.
Nobel laureate Daniel Kahneman outlined two different systems in our brain called the fast and the slow thinking system. In his book  he outlines a very simple method to specifically train this slow thinking part of your brain. You simply take four numbers at random and add 1 to each number in a steady rhythm. This requires your full concentration and should help you in improving your focus for other mental tasks.
With the new version you can now also compete against other players from around the world, by comparing your score every day with other players.
 Daniel Kahneman. Thinking, Fast and Slow. 2011.