Up to 15s is an educational application designed for iPhone users, focusing on enhancing users' mathematical skills in a fun and interactive way. This app allows players to memorize basic math facts, including addition, subtraction, multiplication, and division, for numbers ranging from 0 to 15, as well as their squares and cubes. Users can tailor their experience by selecting specific operations, numbers, and 'Up To' values of 10, 12, or 15, making it suitable for various learning preferences.

The application features five distinct difficulty levels: Beginner, Intermediate, Advanced, Expert, and Genius, catering to a wide range of skill sets. Players earn points based on their performance, with three points awarded for a correct answer on the first attempt, two points for the second, and one point for the third. The app also tracks the time taken for each challenge, displayed on the statistics screen, providing users with insights into their progress and performance.