Talk:Cannon Control Building/@comment-69.113.171.104-20150105024907/@comment-25021853-20150107205234

20, though it looks like you can keep going it's purely for bragging rights as Level 20 is the last with an upgrade listed. It's similar to the Castles during the Clash of Clones 2014 Event, as they could continue to be leveled up but all it got you was one Wall section per Level (which was kind of useful for Boxingham Palace and Castle Recycle as the wall sections for them cost Donuts, but the walls for the Barbarian Castle could be bought for 100 Elixir, far cheaper than the Elixir needed to continue leveling up the Barbarian Castle) while it's not clear what, if anything you would get for going past Level 20 on your Elf Cannon.

I'm getting close to Level 20 on my Elf Cannon, so I'll soon know what, if anything, happens once you get there. I have spent a few Donuts getting my Elf Cannon upgraded, and I've found it's far cheaper to speed up the Elf Cave to send out more Elves and get the Cogwheels from them, rather than buy the Cogwheels directly. Buying the Cogwheels costs 2 Donuts each, while rushing the Elf Cave for 4 Donuts gets you 4 Elves, and they drop 4 Cogwheels about 30% of the time (I've been experimenting and keeping track, and it varies between 25% and 33-1/3% drop rate, but it's always at least 1 in every 4 Elves dropping 4 Cogwheels). So if you're gonna spend Donuts to get Cogwheels, you can spend 20 Donuts to buy 10 Cogwheels directly, or use those 20 Donuts to rush the Elf Cave 5 times, get at least 20 Cogwheels, AND get 20 more Elves to fire off for more Elf Bells. Especially if you're playing frequently, like I do, and keep running out of Elves to shoot in your Elf Cannon, I'd spend the Donuts on rushing my Elf Cave and get at least twice as many Cogwheels as you get buying them directly.