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In no particular order: StarCraft 1 and 2, Metroid Fusion, RuneScape (don't play anymore but lots of fond memories), Undertale, Stellaris, and Divinity Original Sin 1 and 2. But if I had to pick just one it would probably be StarCraft 2. I was never that good at PvP melee but I really enjoyed the campaigns and custom maps.
monobattles was my life for a full year or two
hollow knight, hades, and starcraft brood war are all timeless