Planet/Ball Simulation

Click and drag to create circles. Dark gray means you're currently making it, and light gray means it's there to stay.

Use the X key to place down particles (the purple things) at your mouse cursor.

Use the Z key to switch between modes:

"Ball Sim" means the circles will fall down, and particles won't do anything.

"Planet Sim" means the circles won't do anything, but the particles will be attracted with a force towards them.

"Both" means the circles with fall and the particles will travel towards them.