A modern game asks you for a download, an account, a tutorial, an email address, and ten dollars. Today’s six ask for none of that. Pilot one NYC subway swipe as long as the network lets you; reduce an eight-letter word to three; race London tube routes; hold off the creeps at Desktop Tower Defense; explore a Neal.fun summer camp; zoom into Vaskange’s nested worlds until the screen runs out. Open in a tab, close it when the moment passes.