The round mode influence the way the game shows the questions to the players and how players earn points. In 'quizzes' you can change the round type in the 'Round type' select field in the middle top of the screen.
These rounds offer a bit more interactivity than simple ask & answer questions.
For anyone who want to organise traditional pub quizzes where players can change their answers until the end of the round. These round modes simulates 'handing in the papers' after each round.
These round modes do not contain any questions but instead influence the outcome of the game.
In these round modes you can select specific 'departments' that play against other departments.