1 + 3 = ? - challenging yourself with primary school maths you think that you are smart, let try out! each 1 second, the game will give you one maths task and your mission is to quickly text the right answer to the task. it seem to be easy but watch out, it is not so simple like that. after one right answer, the next task will come with a higher level and your time is shortened too. it is about one minute and you will see that you lose the game. if you get an unbelievable score, let challenge your friends and you will see the fun. good luck!