What do you think are the best ever free Linux games?

After playing games for years, some just seem to stand out as top choices. These are native to Linux, open source and free. Nethack in particular is over 20 years old, and still one of my favourite games. It is still being discovered by players and still in active development. OpenTTD has a huge following. Wesnoth is superb and there are others...

I have written in detail about my favourites:
The Best Free Linux Games Ever

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