It may take time for the rope to load. Controls: V ---- shows / hides variables Click on rope ---- moves point around Space + Click on rope ---- makes point fixed / unfixed S ---- adds free ball Space + S ---- adds fixed ball Click on ball ---- moves ball around Space + Click on ball ---- deletes ball If you are experiencing performance issues, try using TurboWarp: https://turbowarp.org/1307198399?fps=60 This uses Verlet Integration and the Jakobsen Constraint Algorithm.