You make moving sponge by opening the Console^[1]by pressing the tilde key^[2] and then entering a command as seen in the older commands^[3](prefix a '!') or as the newer commands^[4]

Use a command as such:

"!set vy spng number" (number is negative for up movement, positive for down movement, number is bigger for speed)
"!set vx spng number" (number is negative for leftwards movement, positive for rightwards movement, number is bigger for speed)
or a newer style:
"tpt.set_property('vx','number','spng')" (same negative/positive as above)(replace vx with vy if necessary)

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^[1]https://powdertoy.co.uk/Wiki.html?id=using_the_console
^[2]http://img97.imageshack.us/img97/6811/tildekey1.jpg
^[3]https://powdertoy.co.uk/Wiki.html?id=using_the_console
^[4]https://powdertoy.co.uk/Wiki.html?id=lua
And please, USE THE FRIKKIN SEARCH BAR.
#usethesearchbro