Stuck with Level 5, it requires a 98.8% stability gun to go to the next level but I have done all the upgrades in Level 5. Why? Anyone comes to rescue?
Don't rely on the upgrade screen to tell you what will happen with stability. I think there were some around R5 and R6 that didn't show that stability would improve, but it did when you made the upgrade.
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iPhone 6, iOS 9.2