OE Cake is a engine wich provides you with alot of different materials and they have their realistic attributes. Water flows really nice, it is turned to steam when in contact with heat, turned back to water when turned on a cool surface
Fuel burns up when in contact with fire or any form of heating source
With this game, you can make alo of cool chains and stuff with all the different mixes and such that can be made.
One can also make their own materials by mixing different materials. If you mix Fuel with water, you get a flamable liquid, Take the subject "fire" and mix it with "inflow" you get a item that spawns lava.
i've been caught with this for a week or two now It is just the perfect time killer.
I love these physics toys. My two favorites are The Powder Toy, which is one of those sand games, but taken to the extreme. If you want, you can just dick around and have fun making bombs, or you can get more serious and make all kinds of awesome things, from nuclear reactors to CPU's with it; and Phun which is a Newtonian Mechanics simulator. In Phun you can build machinery that, unlike what you can make in TPT, requires moving parts. The only problem is, its a lot more processor intensive, so anything requiring large numbers of small things will run really slowly, for instance anything involving liquids. I haven't put nearly as much time in Phun as I have TPT, so I haven't made anything halfway as awesome as in the video, but even you don't devote a week to learning the ins and outs of it, you can make some neat things.