The Many Many Uses of Sludge is the 15th level in The Puppet Master. To clear it, the player must use "the many many uses of sludge".
Use the left orange sludge and the right blue sludge to blow the stone barrier, and clear a way for the first gnome. Note that doing the explosion in an incorrect place will kill the gnome. Condense the steam with the other blue sludge. Make a gap for the second gnome, and when it's filled, cut a path to the bottom of the level. Finally, drop the remaining orange sludge to turn the water into steam and fill Perry's pipe.