This guide aims to describe how to grab the lemon in Courtyard 2 without needing to break the wall surrounding it.

1. Move the oranges out of the way so that you have lots of space to run up and down.
2. Stand in a position so that the lemon behind the wall is off-screen.
3. Run directly to the lemon. If done right, you should be able to pick it up through the wall.
   Simply walking into the wall, or running into it while it's onscreen will not work.

You can see this being performed here: