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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wellywales: you can play 1 game in which you challenged your opponent, and you can play a second game in which your opponent has to challenge you .. this makes a maximum of 2 games at the same time in the same stairs
(hide) If you are waiting for your turn, click on "change" next to the "refresh" on the main page, then set refresh the page to 30 seconds to get your turn to move displayed faster. (Servant) (show all tips)