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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Why there are ladders (for example as in http://brainking.com/en/Stairs?trg=3&tri=223, and there are others) where there are two players, no games playing, no games recently played against each other and yet you have no player to challenge?
(verstecken) Behalte die Uebersicht über dein Postfach indem du wichtige Mitteilungen archivierst und nutze regelmässig die "Lösche alle Nachrichten"-Option in deinem Eingangs-Postfach. (pauloaguia) (zeige alle Tips)