Well it's basically just a VN, but you can move around the school, and buy gifts to give to other characters and raise their affection level and such. The gameplay comes after the murders, you have to go around the school looking for clues, then you have a trial and everyone discusses the murders and clues and try to decide "whodunit" if you select the correct person basically they are executed, if you select they wrong person then the person who committed the murder gets to leave and everyone else dies, basically game over. Doesn't sound too exciting I guess buts it's a great VN and a well told/written story. Just don't watch the anime. It's abysmal.