Yog is a fun, casual game that requires great reflexes along with hand and eye coordination. Yog means union or conjunction in Sanskrit, or addition in mathematical context.
The game isn't a mathematical quiz, and you don't have to add numbers. As you go along, additions are displayed, and you have to specify if those are correct or not. As the game progresses, the difficulty level of question increases.
Full story from the WindowsCentral blog...