Wouldn't you love to play a card game that required actual skill rather than just blind luck? That is exactly what Preferans for Android is. Intense knowledge of algorithms and calculations are required to win, and if you think you can't just play, you will pick it up faster than you think. There are 6 levels of difficulty with one (Cheater) allowing for cheats. This can help you learn, but don't ignore the other levels that require correct calculations to be successful.
The three most popular Preferans conventions are included, but there is an option to customize conventions as well. See where you stand in relation to players worldwide by posting your score to the Swarm leaderboards and you will be able to compete to make your way to the top. The game can be as competitive as you want. Compete only against yourself or strive for the top spot. It is up to you.
Studies have shown that without constant challenge we lose brain power. This is the perfect game to keep your brain from turning to mush. You can learn to beat the game, develop a new skill, and ward off dementia all at the same time. Truth be told, you'll have fun as well, which pushes Preferans all the over the edge of awesomeness.