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. .
9) If you want to take a break from the Stairs but you don't want to leave completely (as described in the previous point), you can use a Retirement:
* When you set a Retirement, your Step position will be hidden for other players and they cannot challenge you. * You must finish your started games even if you set a Retirement and the wins/loses still count and change your Step position (although it is hidden). * You cannot end the Retirement until at least 7 days pass. After you finish the Retirement, you cannot start a new one within 14 days