Simple game, rules in the post.
Real answers from people here are usually more useful than search results. :)
Any thoughts welcome
A lot of people forget how much variety there is in games starting with A. Assassin's Creed is the obvious one, but I would probably go with Advance Wars. Simple looking on the surface, then suddenly you are three hours deep planning every move like a tiny military genius :)
B has to be Banjo-Kazooie for me. The humour, the music, the weird characters, everything about it felt different when it came out. Plenty of newer games are technically better, but few have that same charm.
Going slightly old school with C and saying Castlevania: Symphony of the Night. Still holds up incredibly well. The exploration, atmosphere and soundtrack are all things that modern games could learn from.
D is a tough one because there are loads of good choices. Doom deserves a mention though. The original changed things forever, and the newer ones proved the series could come back without just copying the past.
Elden Ring for E. Not even a difficult choice for me. The first time wandering into an area and realising you are completely outmatched was both terrifying and brilliant :D
F has to be Fallout for me. The later games get most of the attention, but the whole idea of rebuilding a world after disaster is what made the series interesting in the first place.
Going with Ghost of Tsushima for G. Beautiful game, brilliant combat and one of those rare open worlds where I actually wanted to clear the map instead of feeling like I was doing chores.
Hades for H. A game that should have been a quick distraction somehow became a full obsession. The amount of story they managed to put into repeated runs was seriously impressive.