Reactor Builder is a game that is not only fun but also can educate students about the benefits of HTGR. Why is it a board game, especially monopoly? Even though we live in a digital era, board games are still popular in society. Nowadays, there are several cafes that not only offer coffee or a good view but also a board game to attract some customers. Monopoly as one of the board games is a popular game board and can be played by all ages.