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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King Reza: that can be a little tricky as there are some people who have reached the top of the stairs and are inactive waiting for someone to catch them
(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)