Train Builder is a fun math game in which you have to drag a boggy to the train and complete the target to let it depart from the station. It is an addicting, free game which won't make you bored as it has several levels. Train Builder is a free game from the Techedu which helps student master math skills by having them create trains. This game was created with younger elementary school children in mind and has many different levels of addition, Subtraction, multiplication , division. Train Builder is a free game for students in grades 3-5 to help them master addition, multiplication and division facts. In this way, their math skills will become more fluent and their general knowledge will increase.