I know about the hidden shop that you have to take the timed teleporter to get to but i you go to that island, look to the left you see another island that looks just like the one with the hidden shop. This has been bugging me for a long long time.
Can you get over there? if so how? and what is over there?
to get there u have to go to the 2 columns that have an hour glass at the bottom, the hour glass is blue and glowing, there is a teleporter pad between them. Then when the glowing red "indicators" reach the top of the clomuns and send out "sparks" the pad will glow and you can then step through