No, you don't have to download anything. All games inside our databases are browser-dependent and don't demand any download or installation. That said, some more mature games require Flash player, so You could have to install it if you need to play A few of these games and don't have https://docs.google.com/spreadsheets/d/1qIiTt3d-98iJR7HEFLT9x-I-0b-otIJCrtx2N3QgmCc/edit