One of the by-products of being 3D was the importance of the camera-handling. Even though most of the levels didn't need complex camera setups, some levels could only be solved if the player was skilled enough to move the camera in the correct way - or by using the Virtual Lemming mode. For example, one level featured a massive indestructible block of wall with the lemmings arriving on top; the only way the player was able to deliver the lemmings to the bottom floor was by digging through a certain part of the block which was left destructible, and the only way to handle that was to use the VL mode, because the player was unable to fit the camera through the hole. Some levels include rooms or halls where the camera can't go into (or come out from) and the player has to peek in through windows or use VL mode.