This means that you have to acquire all three buildings, plus the specific amount of balloons, hats, fifes and confetti, in order to get the castle.
By my reckoning, that means you need to obtain a total of 2,445 balloons, hats, fifes and confetti. I already have 68 units, so only have 2,377 to go in 6 days and 5 hours. A quick calculation seems to indicate that I could acquire 3,100 energy points in that time, so sufficient to be able to actually click on enough people in order to get what I need.
That also means I would have to play non-stop for the whole time, having roughly only 6 hours and 10 minutes break per day to eat, sleep, converse with others, swot flies, feed cats, change light bulbs and anything else that might actually need doing in the real world. Poor Mockba and RussianWorld, I wonder how they cope?
Steve (who is definitely not going to start blowing city credits on replenishing energy, and is highly unlikely to ever see an ice cream castle appear in his city any time soon!)
Playername: SteveGPI
City: Hanham
Level: 50
Needs: 2,377 balloons, fifes, confetti and party hats. And then some modules. But will settle for chisels, hammers, drills etc.