Asklemmy

1. Joust (1982 arcade game by Williams)
2. Marble Madness (arcade, 1984)
3. Fantavision (PS/2 - also Fantavision 202x - remake for modern PC)
4. Bioshock
5. Stardew Valley
6. Oxygen Not Included
7. Another World (Amiga)
8. Populous (Amiga)
9. Lemmings (Amiga)
10. Star Raiders (Atari 8 bit)

Games that I have spent an incredible amount of time playing, in no particular order (games where I have noted time, I have played those exclusively without playing any other games):

• Enter the Gungeon (two years)
• Master of Orion (& sequels and likes)
• UFO/TFTD
• Sim City 2000
• Command & Conquer (just the first one)
• Quake World (5 years)
• Ragnarok Online (5 years)
• Transport Tycoon Deluxe (& Open TTD)
• Wizardry 7
• World of Warcraft (5 years)

I'd like to mention that there comes a certain point in skill based games like fps and twitchy MMOs, where your character's movements are so ingrained in muscle memory, your knowledge of the game engines' ins and outs are so thorough, that even just standing around in one spot you know at any moment what action or reaction is going to happen upon your next few key presses, and you have a hundred percent confidence in executing those without a flaw, if you bothered to lift your finger.

That's when you quit, I guess.

Edit: honorary mention for Fallout 1/2/3/NV, TES3&5, Elite/First Encounter, Syndicate, Starcraft 2, Creatures 1&2, Civilization, Master of Magic, King's Bounty & HOMM, DOOM 1/2, Scorched Earth/Worms, Diablo 1&2

This is just out of the games I can recall off the top of my head and no order besides the first title being number one:

• Borderlands (specifically on xbox360 with all DLC)

• Fallout New Vegas (despite never actually beating it once)

• SuperTuxKart

• Rollercoaster Tycoon 3 Platinum Edition

• Sonic Mega Collection Plus (PS2 since I've never played it on original xbox and because I still think it's a pretty good way to experience classic Sonic for those that don't want things like savestates and those that do)

• Crazy Taxi (on Dreamcast)

• Hitman Blood Money/Absolution (purely for how much fun I manage to find in them regardless of their flaws and yes I'm counting them as a single game because I can't say I like one more than the other)

• Spyro Reignited Trilogy (so far the only game remaster I can think of where I'd recommend it over the originals because fuck Year of the Dragon and the portals leading to the minigame like sections in levels causing the music to turn off if you get too close in the original)

• Pokemon Uranium (that one fangames that got banned but is still being updated/my first experience with pokemon fangames and ROM hacks)

• Portal 2 (both on xbox360 and PC because I beat co-op on 360 by myself once and also because level editor on PC and the one level I have saved that I cannot beat despite trying on and off for years)

Civilization III Final Fantasy IX Valheim Kerbal Space Program Stellaris Empire Earth Borderlands 2 Morrowind Halo: Reach Rimworld

The must be mentioned: KOTOR Bioshock(and Infinite) Final Fantasy 4, 14, 5, 6 in that order AOE 2 Red Alert 2 Total War: Rome, Rome 2, Medieval 2, and Shogun Lords of the Realm 2 No Man's Sky Horizon series Space Empires V Battlefield 1942 Medal of Honor(the first one from the 90's, not that bullshit reboot from 2010) Smash Bros Melee, 64, Brawl in that order Crysis Warcraft II: The Tides of Darkness Theme Hospital MDK2 Chrono Trigger

It was tough leaving some of those mentioned ones out of the top ten, but the top ten belong where they are for me for how definining they were/are for me.

Solitaire and SkiFree.