"A dangerously unstable pile of carelessly stacked fireworks. The experience you get from it comes from learning what you can do around it without setting the whole thing off. (Hint: it's a very short list.)"
The Fireworks Pile is the focus of a series of limited-time missions released July 3, 2014.
The total cost to build and upgrade the pile is 4,280,000 and 5d 18h.
Fully upgraded it gives 715 per 8 hours, harvesting this 3 times a day (assuming the player sleeps 8) gives 89 XP/hr/w (XP per worker per hour). (In comparison a solar power plant gives 35 XP/hr/w.) Making this building once upgraded one of the best XP/hr/w generating buildings in the game.
Okay, we're making a hilariously over-the-top fireworks show for Recoil Ridge, so I'm gonna need everyone to pitch in.
I'm going to get the troops to start piling on every ounce of unused explosives we can spare.
I'm manufacturin' gunpowder faster than I can safely make it!
I'm stockpiling bandages and burn ointment at the Hospital.
I'm improving my sprint times.
And I'm supervising with a nice glass of iced tea. Sounds good — let's get to work!
Level 2
Higher! Higher! I want to offend the heavens themselves!!
Level 3
Aw, man, I wanted to help...
Level 4
Ramsey, I love ya, but you're insane.
Level 5
OK, men: from now on, smoking is a court martial offense!
Level 6
I don't suppose anyone wants to see my crater radius estimates?
Level 7
I feel like we're committing a crime against humanity now...
Level 8
I need a danger level above "Extremely Hazardous"... "Apocalyptic," perhaps?
Level 9
Uh, even I'm startin' to get a little nervous about this thing...
Finish mission
Okay, Sheriff, bear with us. I know it looks like an irresponsibly dangerous megalith of deadly explosives, but I think you'll warm up to our work—
OUR work?!
… Once we set the whole shebang off and you see how awesome it is.
Wait! We'll all need to put on these three inch thick carbon lens goggles. Without them, I estimate a permanent 54% decrease in vision for anyone within a ten mile viewing radius.
...
On second thought, maybe we shouldn't set it all off all at once. Maybe… a few at a time? That'll be okay, right?
Reward screen
At the maximum safe rate, we should work through the entire pile in about 27 years...
Levels[]
Fireworks Pile Levels
Building Level
1
2
3
4
5
6
7
8
9
10
Interval
8h
Collected
130
195
260
325
390
455
520
585
650
715
Gold Cost
100,000
130,000
180,000
250,000
340,000
440,000
540,000
650,000
760,000
890,000
Time Cost
1d
21h
18h
15h
12h
9h
6h
3h
6h
1d
Trivia[]
This is the first decoration that can be upgraded, takes up population and has a collectable reward. This is more characteristic for a shop.