This is the virtualization of a well-known prank. STOP is a question and answer game, where two or more people participate, participants choose categories (Ex: Animal, fruit, object, food, etc.) and a letter. The issues of the game are generated based on the categories chosen and players must answer the questions based on the letter that was chosen (Ex: Name of an animal that begins with the letter L). The game is finalized when one of the players finishes answering all the questions. This application has 19 categories and a knowledge base with more than 95,000 words registered at the moment and with the ability to apprehend with the user.