Strategy games sounds boring, but they are really amusing although you have to think very logical which can be fairly difficult from time to time. The best-liked games are "Sudoko" games, the ones where you have little squares with very few numbers and you need to fill 'em in wihtout having the same number twice in a square, a horizontal or vertical row. Those games usually require more time than the others, there are no levels but different levels of difficulty. In order to advance through the game one needs to focus, read and follow the instructions carefully or little mistakes will make the game unsolvable. Brain Training Games speed up your logical thinking and games such as Sudoko your mathematical skills. Those games are for any age group, but not at all for a little stress-break during work, rather to get a clear mind. Do not think for too long but start playing now!