If you’re stuck on a slow train and need a quick mental break, give Solitaired...

https://wiki-stock.win/index.php/The_Ultimate_Productivity_Killer:_Finding_Solitaire_and_Spades_in_One_Browser_Tab

If you’re stuck on a slow train and need a quick mental break, give Solitaired a try. It is my favorite for fast, no-login play that gets you straight to the cards. The best part is the massive variety of games, so you never get bored