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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tenuki: Abigail got to Step 2 by beating someone who has since left the Stairs. You can only challenge players at your own level and the three below so she has the option to challenge you but you must wait for a third player to join the Stairs.
(hide) If you only look at some of the discussion boards on a regular basis you can add them to your favourite boards list by going to the Board page and clicking "Add to my favourite boards". (pauloaguia) (show all tips)