Call of Duty: Heroes
Submitted by: David K.
Celenium is Key:
If you want to get far in the game, you'll have to make the most of a precious
resource: Celenium. Early on, the easiest way to acquire this is by earning
achievements, which reward you with small piles of Celenium. Over time, that
can stack up and allow you to invest in builders that will allow your base to
function much more efficiently (you should mostly ignore other potential uses
for your Celenium).
You can sometimes also find Celenium by destroying rocks and trees, so always
be on the lookout!