What are your favorite board games to play solo?

I've recently gotten into the board gaming hobby and picked up a few solo games for when I want to play but don't have anyone to play with. I was wondering what everyone's favorite solo board games were, fully solo, solo modes, or 3rd party solo rules.

So far my favorites have been the two lcgs I picked up, Marvel Champions and Lord of the Rings the card game. They both have similar gameplay but are different enough to keep things interesting. I really enjoy the deckbuilding aspect too, though I'm new to it so theres lots of trial and error involved.

I've also played a bit of Star Wars: The Clone Wars, a pandemic spinoff, which seems like it could be fun once I get into it more.