I remember playing this really old computer game but I can't remember the title. The gameplay is on of two ways. First way: You play a red knight (who I think is part of the knights of the round table) and all of your other red knights friends have been captured. You go throughout this castle solving puzzles and rescue your friends. The Second way: You play a red knight and you go and rescue a King.

It's one or the other but it was really fun but I can't remember it.

It reminds me an old ZX Spectrum Melbourne House game from 1986/1987 called Throne of Fire. The developer was Mike Singleton. No idea if the game was launched in PC or Amiga systems.

https://www.reddit.com/r/tipofmyjoystick/ can help you