FYKOS is a correspondence physics competition for all high-school students (under 19 years) with interest in physics. We publish a problem set six times during a school year. You have approximately one month to solve these problems and to send us your answers, ideas and conclusions back. We correct and mark your solutions, and then we send them back to you with our commentary, next problem set and current rankings. At the end of a school year, a list of the best participants is put together. We reward leading participants with special prizes. For the best participants of the previous half-year, we organise spring (or autumn) physics camp full of sports, physics and other games. We organise all sorts of events: - FYKOS' Physics Brawl - Online Physics Brawl - The Week of Applied Physics - The Day of Experimental Physics - FYKOS' lectures