Students in international groups simulated the establishment of a company. They divided responsibilities: production director, marketing specialist, accountant, etc.), chose a product to produce (medicine, building blocks or soap). Each employee received his instructions, they participated in a meeting where duties were discussed and everything went on like in the life, except that one year passed during the hour. Students produced products, sold them, received money, purchased raw materials, made contracts and estimated the balance. Participating in the game students used knowledge acquired in mathematics (parallel sketch formation), chemistry (reading chemical formulas) and economics. It was interesting but none of the groups went bankrupt. At the end of the game students assessed the benefits - they understood how to build their own business, realized why they should study mathematics and science at school.