1+2=3? Mental calculations can be real brain teaser. Train yourself calculating fast and respond quickly to get the most points in this math game!

Fast, fun and easy to master, 1+2=3 contains mathematical operations always resulting in 1, 2 or 3. Come and compete with other players in the world to find out who is the best in mental arithmetic!

- Increasing difficulty
- Achievements to unlock
- World leaderboard