C-9 Canisters create the majority of the explosion effects in the game.
C-9 Canisters are sprites that explode when shot. There are a few different sprites that do this: SEENINE (#1247), OOZFILTER (#1079), EXPLODINGBARREL (#1238), and GUNPOWDERBARREL (#4360). You can also place the underwater explosive, BOUNCEMINE (#940). All of these sprites can be used as a visible explosive which manipulates the shape of sectors (holes in walls, etc.), but only one of these sprites can be used as an invisible explosive: The SEENINE sprite (#1247). If the SEENINE sprite is shrunken to it's smallest horizontal size, it will appear really thin in BUILD, but completely invisible in the game itself. If activated by a trigger, the invisible SEENINE will cause a visible explosion in the game. In the following C-9 Effect tutorials, you will be using the SEENINE sprite for most of the effects.