Press the following keys to spawn a polygon using: E - elastic physics R - rigid physics S - static physics (none applied) G - gravitational physics Use the scroll wheel while hovering over a node to increase/decrease its mass/size Select Tool: Click on nodes to "freeze" them, click and drag to move them. Click and drag elsewhere to create a force. Add Tool: Click on stage to add a new node. Click on existing nodes to select them: select 2 to create a link between them. Delete Tool: To delete a node, click on it. Any links to the node will be erased as well.