Sandspiel

What it is

A falling-sand sandbox with fire, acid and rockets.

Why it's on this list

Drop sand, water, ice, lava, acid and oil and watch them react. Draw walls, plant seeds, light it on fire. Nothing to learn, nothing to win, impossible to stop.

Who it's for

Anyone who likes physics sandboxes.

Pricing

Free

Alternatives

• Nealfun

Details