4. Quickly shoot a grenade over the big building, so that it destroys the panes of the small building. This shot isn't easy, because if you aim to high, it doesn't destroy the farthest pane and if your angle is too low, it doesn't destroy the doorpane. | 4. Quickly shoot a grenade over the big building, so that it destroys the panes of the small building. This shot isn't easy, because if you aim to high, it doesn't destroy the farthest pane and if your angle is too low, it doesn't destroy the doorpane. |