If you liked Threes then try this one! And its free and addictive, some people play it tens of times a day.
Are you a brainiac? If I say 1+2+3+4=6, which of the four numbers you add up is wrong? Yes 4 of course. But when there is a time limit, and the numbers get higher, the game gets more difficult!
Scores are matched to the rest in your country, rewarding you up to 5 stars if you are within the best 20%. So in time, as more users in your country get better, your starscore may even go down from 4 to 3 stars.
Ten different variations of this game, one of which is for savants only. Though I know you will try it...