What are the best addictive pc games ever?

Hard to pick one. So here are some. Some are on non-PC computer platforms.

• X-Com: UFO defense (the original Xcom) as well as it’s more recent reboot, Xcom: Enemy Unknown and Xcom 2 and their more expansions
• Jagged Alliance 2
• Wizardry on the Apple II
• Wizardry: Bane of the Cosmic Forge (I played on a Mac). Messed my college years up; I’d play all night then sleep all day, and people had to wake me up for dinner
• Harpoon (I also played this on Mac) Loved this game so much I actually subscribed to the Naval Institute Proceedings journal to improve my strategy and learn
• Ultima IV on Apple II
• Baldur’s Gate II with Throne of Baal expansion
• Planescape: Torment
• Diablo II
• The Elder Scrolls V: Skyrim
• Elder Scrolls: Oblivion
• Master of Orion II
• Master of Magic (even though very buggy)
• The original Doom
• Fallout 1, 2, 3, and New Vegas
• Divinity: Original Sin 2
• Metal Gear Solid V: The Phantom Pain
• The original Wasteland
• Borderlands 2 (I played mainly on Xbox, but avail on PC and have played some there)
• Titan Quest and the Immortal Throne expansion
• Star Control II
• Silent Storm and sequel
• System Shock 1
• Knights of the Old Republic 1 & 2. (Played on Xbox but avail on PC)
• One of the original Might & Magics, I think number 2
• Freedom Force and sequel
• Deus Ex: Human Revolution