Lumosity has just launched two new games - Addition Storm and Division Storm.
For a limited time, you can try one of Lumosity's newest problem solving games for free, solving rapidly moving addition and division problems before elephants and lions, baseballs and basketballs hit the ground.
Both games are part of Lumosity's Exercising Arithmetic games portfolio used for mental calculations, increased aptitude with numbers and figuring out costs.
Please find also my previous post Serious Games For Mental Workout.