https://store.steampowered.com/app/860390/Math_Speed_Challenge/
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STEAM KEY REGION FREE GLOBAL

Challenge your equation solving speed in this fast paced math game. Each round consists of three math problems: addition, subtraction, multiplication. You must select the correct answer in the limited amount of time that would correctly answer the equation. You can track the number of right and wrong answers by count and by assigned letter grades that change as you progress. Select from multiple difficulty settings and restart at anytime to clear your progress and try to achieve 100%. With endless levels, randomized math equations, multiple difficulty settings, and an easy to use interface Math Speed Challenge will provide hours of challenges.

Features:
Endless Rounds
3 Problems Per Round
Addition, Subtraction, and Multiplication Equations
Multiple Difficulty Settings
Random Math Equations

ИНСТРУКЦИЯ ПО АКТИВАЦИИ:

1. Необходимо скачать и установить Steam http://steampowered.com/download/SteamInstall.msi
2. Зайти под своей учетной записью или зарегистрировать новую.
3. Перейти в раздел "добавить игру" и выбрать "Активировать через Steam...", ввести ключ полученный после оплаты.