If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Drag and drop physics game. There is a total of 30 levels. All you need to do to complete a level is to drag the red object inside the marked area.
New exciting feature: The Staple, now you can tie 2 objects with a single click. Follow ingame instructions.
And also the progress is saved now.