On Steam, there is RISK: Global Domination, which is based off of the classic RISK board game.
There is the original world map, but also many other maps that you can play as well as modifiers to make the matches harder and/or different.
The game used to be on tvOS, and that is how I played it most. It was a little better on tvOS than Mac, but the tvOS version is no longer playable. The Mac version is almost identical to the iOS and iPadOS version.
I think it is free to try.