Patience is key as you build bridges to save your little friends.
To install a piece of the bridge, click on a green anchor point where you would like it to start and draw a line to where you want the piece to end. To remove a piece of bridge, scroll on top of it and click the left mouse button. To delete multiple pieces, click on the junction between them. Click and drag to scroll around the level. To zoom within the level, use the + and - buttons.