Going through Campaigns and Tower Defense levels require one more important thing other than a highly skilled set of heroes—and that is Stamina. Every run in the Campaign mode will cost a few Stamina. For the Normal Campaign mode, 6 Stamina points will be required. While for the Elite and Legend modes, 12 Stamina points is required.
If you are one who would boldly go for several Campaigns in a single sitting, then Stamina may be quite a limited resource for you. For those who find themselves constantly in need of Stamina for Campaigns, the easiest way to earn more Stamina would be to buy Stamina with a few Diamonds. Your first purchase of 120 Stamina will cost around 50 Diamonds – this will be quite difficult to manage since Diamonds are also hard to get by, especially during the early stages of the game. So be sure to prioritize what you would want to focus on with your purchase—Stamina or Diamonds, or even both!
There are, of course, a few ways to gather enough Stamina for free. One is the through the Daily Buffet Rewards from the To-Do List, which is made available every single day Another way to get free Stamina is when you are gifted a few Stamina points from your Facebook Friends—after you have successfully linked your game account to your Facebook account first.
Whether buying or waiting out for free Stamina hand-outs, it is recommended to plan your daily log in activities beforehand. Think if you will be able to play a long and continuous game or if you will just be playing a few stages here and there. Doing this will help you determine if purchasing Stamina (through Diamonds) is even necessary at all.