Including DLC, micro transaction purchases, etc. If you got a game for free, please also list your non-infinite next best.
For me it’s Team Fortress 2. $100 total spent on hats and the Orange Box back in the day, 4200 hours plus of fun, meaning 2.3¢ AUD per hour. Initially I thought DotA2 would be my best but it turns out I’ve spent a lot more money in that game than I thought…
My worst is God of War: Ragnarok. Bought it full price for $95 AUD, only played 2 hours and hated it, meaning $47.50 AUD per hour.


Most, probably Skyrim. Across all platforms I’ve only spent around $80, and have around 5,600 hours in, so about 1.4¢ per hour.
Least is far harder. There have been several games I’ve spent $80 on that I played for a bit, didn’t like, and never touched again.
Honorable mentions for most:
Hitman: World of Assassination: 7.3¢/hr
Forza Motorsport 6: 5.2¢/hr
Fallout 4: 3.3¢/hr
Assassins Creed Odyssey: 4.5¢/hr
Oblivion: 10¢/hr
Halo MCC: 7.8¢/hr
Halo Reach: 8.2¢/hr
Rest of the Halo series is probably around 10¢/hr each if I were to guess but I don’t have hours tracked for the rest of them
Minecraft: 5¢/hr at a guess
For cheap games that I got a ton of enjoyment out of but maybe not necessarily a ton of playtime: Gunpoint, The Silent Age, Celeste, Limbo, Inside, Stanley Parable, Monaco (I do actually have a fair amount of time in this one but don’t have hours tracked, maybe 20¢/hr but those hours were thoroughly enjoyed), Little Nightmares. Probably more I’m forgetting at the moment.