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.
(Free) Most: Super Mecha Champions, which was a free battle royale game on Steam that was a port of a mobile game. Best FREE.99 I ever spent, was such a fun game until servers closed.
(Paid) Most: The Legend of Zelda Ocarina of Time. Literally peak game. It got me into modding and software development, and I still play it to this day. Best $59.99 I ever spent ($59.99 brand new for the 1.0 gold cart in 1998)
Worst: Need for Speed Unbound. Worst $4.99 I ever spent, I turned the game off after the characters in the game couldn’t stop yapping in my ear about “police and politicans oppressing street racers.” Also the driving physics suck because of course they do, Criterion made it.