The knights are playing an arcade-action game on a console, and you will be the one controlling the knight in the game, using the four arrow keys to move and the spacebar to shoot arrows. There will be dragons, ghosts, walking pumpkins, and other dangerous creatures that you need to defeat.
Defeating the monsters will leave diamonds behind, so grab them to increase your score, and be on the lookout for any kinds of power-ups that might be dropped, since you can use them to your advantage to take out the enemies quicker and faster, and deal more damage with one arrow.