If you are looking for older King's Quest titles, several high-quality fan remakes are legally available for free:
: Available as a free download on the PlayStation Store for PS4 and PS3. The Complete Collection vs. Season Pass King’s Quest (2015) Complete Free Game Download...
: Includes all five chapters plus an exclusive playable Epilogue not available in other versions. It is available digitally for roughly $29.99 on the PlayStation Store and Xbox Store. If you are looking for older King's Quest
: You can often find used physical editions for PS4 or Xbox One on eBay or Mercari for around $20–$24. Legacy & Fan Remakes (Always Free) It is available digitally for roughly $29
If you want to play beyond the first chapter, you have a few options:
: Download King's Quest - Chapter 1: A Knight to Remember for free.
While the full "Complete Collection" is not officially available for free, you can start the journey without cost using these official sources: