Drag and throw the ball around. This works by updating the mouse positions at intervals, and calculating the velocities based on these. Press space to show the variables. Now 100% pen!
Use in fullscreen for less glitchiness. If you have a touchscreen, it's much more fun to use. This has got to be one of the coolest things I've made. I was inspired to make this whilst playing Little Inferno (Great game BTW)