Instructions
Load "Powder Toy." Select an element from the visible element box and place some of that element in the black background. Remember the name of the element you chose. For the sake of example, say you used the metal, or METL, element.
Press the "~" key. This will open up the in-game console, where we will be manually changing the element to one of the secret elements.
Select which secret element you want to turn the METL into. The secret elements are RIME, FOG, MORT, LOVE, LOLZ, FRZZ, FRZW, BIZG, BIZS, BRAY, SPWN, SPN2, DYST and SHLD 1-4. You can find out more about what these elements are in the link in Resources.
Type "!Set metl type [secret element name]" into the console, using the name of whatever secret element you want to turn the METL into. The "!" is important to include because the "Powder Toy" coding was changed to LUA, and the "!" allows you to execute older commands within the LUA interface.