Blockudoku
A good educational game that will help pass the time if you have a free minute somewhere. Develops a lot of logic. From the first time, you may not succeed, but then you will enter the system and everything will work out for you.
Tune your mental channels to study the mechanism itself. When you understand the smallest thing from the main idea, the result will not be long in coming.
Around you is an atmosphere of numbers and logic. This will help you focus and achieve results. Take pride of place in the standings.