The Powder Toy is a freeware sandbox game, in near-constant development since 2008, which features arguably the most advanced physics ever seen in a Falling Sand Game
. It currently has 13 categories of elements, many of which contain dozens of unique materials. TPT (as it is abbreviated by fans) simulates, in addition to particles, air movement, heat, electricity, radioactivity, optics, gravity, and nuclear fusion. More information about TPT can be found at the official wiki.
The Powder Toy contains examples of:
- Artistic License - Chemistry: The Powder Toy is full of it.
- Coal (and its powdered variant) will withstand temperatures of over 9000 kelvins, yet don't ignite until touched by a fire particle.
- Anything flammable can burn without oxygen, and won't leave any ashes behind.
- Nitroglycerin will form TNT when it touches powdered clay.
- Wet clay hardens under pressure.
- Salt water makes quartz crystals grow.
- Artistic License - Nuclear Physics: Deuterium oxide (aka heavy water) expands when heated and readily undergoes nuclear fission when hit by neutrons, which can make plutonium explode.
- Baby Planet: The radial gravity mode allows players to build these.
- Taken Up to Eleven with black holes, which suck things in and act as a center of gravity. They can be surrounded with a layer of diamond to provide a platform that you can build even smaller Baby Planets on.
- Convection Schmonvection: Partially averted. TPT fully simulates heat (and its effects on air) but by default only does so for particles. Ambient heat is optional.
- Faster-than-Light Travel: Given how slowly photons travel, stickmen can sometimes run faster than light.
- Hollywood Acid: TPT's acid is pink, dissolves everything (except diamond) and can be lit on fire.
- Made of Explodium: Rubidium, a metal with a low melting point that explodes when wet. It's based on the real-life alkali metals.
- Made of Indestructium: Diamond.
- Neutron Bomb: You can build these.
- Phlebotinum Bomb: EMPs might count. When powered, an EMP destroys all activated electronics on the screen.
- Shock and Awe: There are two(!) kinds of lightning the player can use, and both can be pretty destructive to surrounding materials.
- Stuff Blowing Up: There are dozens of different explosives the player can use, not including the radioactive elements. Most of them are activated by lighting them on fire, though rubidium detonates on contact with water, and several types of "bomb" elements explode simply by touching things.
- Sickly Green Glow: Plutonium and uranium are both a dark greenish color, and in certain view modes glow.
- Slow Electricity: Spark waves travel through metals at a visible rate and powered elements only activate when the wave reaches them. INST is a little better about this.
- Slow Light: Photons.
- The Dev Team Thinks of Everything: There's an element for almost everything, ranging from VIBR (stores energy and explodes) to CRAY (creates rays of elements when powered), and one user has reported seeing a star form after an explosion.
- You Nuke 'Em: There are countless ways to do this in TPT. The easiest is to just dump some plutonium in a metal tank and add neutrons.