Grimrock

On the west end of Twigroot Tunnels, there's an area with four locked gates right near the philosopher's stone area. Behind the south west gate there's a green shiny potion yet it's unreachable. I haven't found any button to open the gate. anyone managed to grab the potion? Is there a hidden button, or I can get it only from some method I obtain later on?

thanks

After you solve the Philosopher Stone puzzle you get access to a teleporter. There is a hidden button on one of the walls next to it.

Thanks! missed that one..