It's late, and the city is quiet. Most businesses are closed, though there are some people working late. A perfect opportunity for some sneaky Powderista to plant a single pixel of BOMB in the old steam tunnel or the abandoned mine, or drop it from the sky.
Just. One. Pixel.
Then you get less predictably unpredictable results, but possibly much ROFLness too. It's just that BOMB is what it's built for and most tested with, so there are more places where it is effective.
Some cheater tips:
On the west side of town, the white stars mark good places to drop from (I didn't do this on purpose! Honestly!)
The low red stars can be used to make the BOMB spatter widely. Can be very effective. (Again, not actually planned!)
The school (low wide gray building) is a good target, from above or below.
Dropping from above on the west side usually produces good results, but there are a few extra good locations in the steam tunnel -- school, between other buildings....
On the east side, your best bet is the mine tunnels, especially somewhere under the mayor's house (biggest one). I put in a few hidden helpers to make it spread.
Tire of bombing?
Give the bridge a good sparking.
Press W, count to 2 or 3, press W again. Hilarious.
my entry is: https://powdertoy.co.uk/Browse/View.html?ID=3071152