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: definitely Guild Wars 2 - paid around 100 GBP for 5000 hours of fun over 11 years, so that’s £0.02 / hour :)
Least: the ~540 bundle games in my Steam backlog I haven’t played yet, bc I’m playing GW2 and Genshin instead 🙈