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. .
dmk: That is correct. Once you at the top (or even on the bottom), you do not have to challenge anyone - so in a way, you can protect your spot until someone climbs up to you to challenge you.
(esconder) Pode usar algum HTML simples nas suas mensagens ou, se tiver uma inscrição paga, também pode usar o Editor de Texto Avançado. (pauloaguia) (mostrar todas as dicas)