Board Game Arena

Perfect, thanks

I generally only play turn-based games with friends. When I'm at a loose end and they're busy, I'd like to try out some new (to me) games in solo mode. Is there a way of finding which games offer single player mode? I like Terraforming Mars, but there must be other options.

Unless there's a BGA convention for how to politely thank your opponent, people are going to say different things (or nothing) and there's no way to know how they mean it or how it will be received.

Best not to let it irritate you.