To find out what stairs you can currently challenge someone in, first go to the Main Stairs Page, then click on "Show your stairs only" link. The ones in BOLD are ones you can make a challenge in.
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Fencer: I've seen that one before but I'd forgotten it.
The 30 days value is about 4100. It doesn't seem to discount the non-countable one-peekers, though, so I'd say my estimate is more accurate as an active players count whereas the languages page (and the raw players list) is a logins count.
(hide) You can send a message to your friends with just one click by adding them to your friends list and then clicking the small envelope by their name. (pauloaguia) (show all tips)