Find in this article the answer for: Each of these brothers has a sister. How many siblings are there Brain Test. If you are looking for a word game to kill free time but at the same time that challenges your brain and improves your skills then Brain Test is the best option. Brain Test offers a variety of brain teasers and riddles that will put your brain in work. You definitely need to use your skills and knowledge about different disciplines but also sharpen your soft skills such as determination, creativity and logic. In each level you will be given a particular question or situation that you need to solve in order to get to the next level. Use all the given information and try to go beyond regular answers. The game is all yours to explore, go for it!