Brooklyn Bridge

I've found all objects but I can't get the pick axe to break the wall

I'm having the same issue - cant work it out!!!

That sounds like a glitch. If you purchased the game from BFG I would contact them. They will probably tell you to uninstall the game and re-install it. This means you'd have to start over though.

Also, in some games it's a matter of having the object in exactly the right spot. Have you tried using the tip of the cursor and/or the tip of the pickaxe. Sometimes the game looks for the actual object or it wants the cursor on the exact spot. The guide shows the exact spot to use the pickaxe on the wall.