Work perfectly outdoors:

• Smallworld
• Photosynthesis
• Kingdomino/Queendomino
• Magic Maze
• Azul
• Azul: Stained Glass of Sintra
• Century: Eastern Wonders

Works well with just a couple weights for some cards if windy:

• My Little Sythe
• King of Tokyo
• Forbidden Island
• Forbidden Desert
• Forbidden Sky
• Downforce
• Pandemic
• Onitama

I would do horizontal if it weren’t for the weight on the boxes lower in the stack and the difficulty of taking a lower game out.