Knights is an old Amiga 600 game. It is only playable 2 player and the screen is split vertically. Each player wanders around a large castle with multiple rooms. The objective of the game is to kill the other player until they have lost all their lives, or until the objective set at the beginning of the game is met.
During the game players can place traps for the other knight, they can pick up weapons (each with their own attributes), potions which give them certain powers for a limited time, wands which allow them to use a magical attack, and books, which were generally used for objectives.
Also roaming around the castle are bats and skeleton warriors who attack any player they meet.
The great thing about Knights is the customization of the game. You can set the number of rooms, the number of monsters, whether they respawn, the victory condition of the game, the types of wands available during the game, and other tweaks.