Algodoo

All colored circles (marbles) are exactly the same size (radius = 0.25 meters)!


By the way, if you swipe your scene to the right before you save it on your computer, then it will display the scene centered correctly when other people download it! Then you won't need to tell everyone to swipe the scene to the right! The image you see when you save the scene is the image that will be displayed on the Algobox website.