Zoffer is a casual strategic number board game, in which numbers become actual values. Each move will influence the following moves, as in Chess. The game is fast, though - you can play one game in 10 minutes or in less than 1 minute, if you're experienced.
Zoffer is quite easy to learn - in the AI mode, you will have a temporary in-game-help at level 0 and 1 and a "how to play"-section. You will probably not learn it as quickly as you would learn Tic Tac Toe (which is a distant relative) but faster than Chess (which is also a distant relative.) Play against a very strong AI (6 levels of increasing difficulty available) or against the best players on the planet. And check the AI / Multiplayer (Elo) leaderboard to follow your rankings.
This is a game for thinkers. People who anticipate. People who like a challenge.
A brain game with numbers. Play against real people or against a strong AI.