Sir Lancelot is a platform game where players guide the titular knight through 24 castle screens in search of treasure. Each level requires collecting all objects within a time limit to reveal the exit. The game features fixed-pattern enemies that must be avoided through strategic jumping and timing, as Lancelot has no combat abilities. Players can jump any distance safely and climb upward-only sections, making careful planning essential. Contact with enemies costs one of four lives and resets the current screen. The Spectrum version follows a predetermined level order, while the Amstrad version allows free level selection.