Santuary keys

Hello, i need to know who i win santuary keys in the game. I already play for a long time and not win anyone, help!!
Each time you beat a level in the sanctuary, you get pieces of some of the soldiers. At least the ones that you can unlock at whatever level of sanctuary you are at. So the more you play it, the more pieces you get, and you can then eventually unlock more and more of the sanctuary helpers
You unlock sanctuary levels by completing regular levels with a 3 star rating. That's how you get keys. To get pieces you beat any sanctuary level with any star rating. You canbget free pieces for any unlocked soldier by watching a video ad, this can be done through the allies sub menus.
But when I complete one regular level not show the star rating, how i can see this rate? Sorry my bad english, i'm br!
See my last repply
See my last repply
When you finish a level it takes you to the results screen. This is where you can see your earned xp, acquired good gold and obtained items. Above all of these things are three stats which will light up according to how you well you did on that level. You can also look at your star ratings on any of the level select screens. All of the levels have 3 stats below them.
A regular campaign level is where you need to get three stars. Those three-star completions unlock Sanctuary stages. Sanctuary levels are not measured or ranked; you either beat it or you didn't. If you beat the Sanctuary level, you're rewarded with pieces of soldiers.