How do you complete Level 26 on Dooors?
Drag the ladder to the left (under the chain) and click at the
top of the room... the second pull chain will drop down.
Then pull the left pull chain until the door starts cycling
closed-closed-open-closed-closed-open, over and over.
Then pull the right pull chain when it is open.
If you miss it, just try it again... left to start it, right to
stop it. When you get it to stop at the open place, then you can
click through.