It could be visually beautiful, mechanically or otherwise.
I’m a visual person, so I have to go with Photosynthesis. It has an amazing table presence and the artwork is amazing. Seeing the trees slowly fill the clearing and, if the lighting is right, cast their shadows is very special.
What's your most beautiful game?
@tabletopgamesblog
I'm going to say Tsuro.
It looks lovely (to my eye - both on the table and in the box), the game takes moments to teach, the components mostly explain themselves, and I can play it in most company - all of which is beautiful to me.
Also it really annoys some folk who consider themselves "serious gamers" and that is beautiful too.
Tabletop Games Blog
Rob Harper (he/him)