The Altera Centauri collection has been brought up to date by Darsnan. It comprises every decent scenario he's been able to find anywhere on the web, going back over 20 years.
25 themes/skins/styles are now available to members. Check the select drop-down at the bottom-left of each page.
Call To Power 2 Cradle 3+ mod in progress: https://apolyton.net/forum/other-games/call-to-power-2/ctp2-creation/9437883-making-cradle-3-fully-compatible-with-the-apolyton-edition
I'm playing Ultima IV: Quest For The Avatar on NES at the moment. For some reason, I really got into this game and Ultima:Exodus... but only for NES. I like the graphical style on NES better than the old PC games.
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appeal versus the PC equivalent of the time
PC graphics of the late 90s makes my eyes bleed nowadays. I'm not sure when the Ultima you're referring to came out, but I think 7 was early to mid 90s so...
Ultima IV was fun on the NES. My older brother was better at it than me. I preferred the more simplified Dragon Warrior and Final Fantasy games, but Ultima had some really cool bits, like scamming shop owners and gathering herbs to cast spells. I remember renting Exodus, but it wasn't the sort of game you could really play much over a weekend.
I've got a bunch of them through gog.com, but you're right that the PC versions just aren't as easy to get into.
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