Solving equations in Math Test 21 turns calculations into a mental marathon, where your speed of thought determines your success at every step. You have to give the correct answers, trying to find the unknowns in the examples at each level of this quest in time. Pay close attention to the problem conditions and quickly choose the correct option to strengthen your numerical and logical skills. For each accurate solution and quick transition to the next step in Math Test 21, you are awarded game points. Calibrated calculation and the ability to concentrate will help you cope with complexity. Your erudition and ability to analyze number chains will become the basis for a record in this useful competition.