The goal is to sum up faster than your opponent.
Your opponent and you get the same board with the same stones and the same target sums.
The winner receives score points and climbs up the season leaderboard.
After a week, the score points are exchanged for a medal. The more rank points the more valuable the medal.
The player who has collected the most and most valuable medals is at the top of the leader board.
Each week you get the new chance to receive a better medal.


ONLINE-MODE:
Play against real players around the world and track your progress on the leaderboard. You can create an account or play as a guest.

TRAINING-MODE:
Here you play against yourself. You try to beat your own average time or make as many rounds as possible in 60 seconds.

The game trains:
- Add up with small numbers.
- The rough estimate.
- Your feeling for numbers.
- Your eye-hand coordination.

What are you waiting for? Sum up!