For my second place Flubber Mountain from Mario RPG is a banger! https://youtu.be/FaAc87l3o3o

Civilisation IVs Baba Yetu. Still gives me chills. I’ve seen it performed by a small choir and is just as good. https://youtu.be/IJiHDmyhE1A

I’m deep into tears of the kingdom at the mo. I’m trying to map the depths but it’s a nightmare to navigate!

Just one more day and then I’ll stop

It’s my go to mobile game. It will auto shutdown if you leave it long enough but will save your progress and start you at that point on the next load

I’m probably alone in remembering this game but I loved Hardwar back in the day. It’s an Elite style trading game set on Titan. The player pilots a ‘moth’ ,a small flying craft, between craters.
It had an interesting story that played out as you explored with areas blocked out, due to events, and made accessible later on.

The developer closed doors but IIRC at least one member of the team released a patch that had been developed later on.

I played it pretty obsessively and it had a small passionate community but it wasn’t a hit.