well I once programed powdertoy (just for fun) and you can make gas fall slow or wood that is un-burned able... But i can't compile it so i can't test it...
ok lolzy, ill type properly, gov'ner. just kidding... englishman fail ^ that whole post was off topic, to make it on topic, click this ----> Linky LOL it goes to a story of the easter bunny ^_^
Propane: when you throw the propane it goes up fast and if it is lit, Creating a fast flowing blue flame, produce no smoke.
Hydrogen sulphide: this is a heavy and thick gas, dispersed as Does Not much as Others, and is a flammable gas.
I would like to change spark (SPRK) for electricity (ELCT), because electricity can only be used in electrical conductors, however the spark can be generated in the air like a particle that remains for a short time in the environment. and is usually bright yellow or bright blue