Find the right door to move on. You need to focus not only on the math problems, but also on the islands. Once you find the right door and open it, the island will disappear, leaving only a small island under your feet. Move on from there. Time is also working against you. Every time you open the correct door, you get extra time, but if you open the wrong one, you lose time. The math problems also get harder and change. Moving across the islands will also become more and more difficult. Your agility, speed, and math knowledge will all be challenged!