Cerulean Core
Cerulean Core is required for upgrading nondefensive buildings to levels 10+. It can be obtained by the store (
40) alone or in bundles, Mission defeating Level-350 Maar, or won in Zoot's Loot, Zoot's Jackpot, Builder's Box, or KIRA's Gift.
Cerulean Core sales
Edgeworld Mail, 2012 Oct 12 10:00 PT (3d14h)
"35% OFF Cerulean Cores!"
Still haven't built your Level 14 Command Center, Fleet Academy or unlocked all the levels of your Defense Simulator and Engineering Lab? Now is your chance to purchase Cerulean Cores for the low price of 25 Platinum until 12:00pm PST (noon) on October 12th[sic]! There has never been a better time to buy! Make sure to get yours today before its[sic] too late!
[After the Oct 10 interface makeover, this sale is not reflected in Store, only in Daily Update, where also the Daily Login Bonus was at last awarded to Google+ players.]
Edgeworld Mail, 2012 Sep 10 12:00 PT (2d)
Still haven't built your Level 13 Command Center, Fleet Academy or unlocked all the levels of your Defense Simulator? Now is your chance to purchase Cerulean Cores for the low price of 20 Platinum until 12:00pm PST (noon) on September 12th. There has never been a better time to buy! Make sure to get yours today before its[sic] too late!
Edgeworld Mail, 2012 Aug 16 14:00 PT (4d1h)
Still haven't built your Level 13 Command Center, Fleet Academy or unlocked all the levels of your Defense Simulator? Now is your chance to purchase Cerulean Cores for the low price of 29 Platinum until 3:00pm PST, August 20th. Now get out there and start building!
KIRA Mail, 2012 Jun 18 12:00 PT (1d)
Still haven't built your 2nd Warp Gate, Fleet Academy or unlocked all the levels of your Defense Simulator?
Now is your chance!!!
Purchase Cerulean Cores for the incredibly low price of 20 Platinum until 12:00pm Pacific Time, June 19
Act now, because this special limited time sale won't be back soon!
Above: After the timer ran down to 01s. Below: The new Daily Update screen.