From great to trash to great – Tank Battle: East Front 1943 Review

Bought complete series (1943 - 1945) for my original IPad. Put many hours enjoyable gaming. They made revision, now it doesn't work. Please fix. 4 months later - works perfectly now. Tiger tanks, Elefants, JagPanthers, T-34, KVs, JS II. Thank you for fixing. Have 2 questions - 1) my original IPad supports up to OS 5.1, how can I buy & run your apps requiring OS 6? 2) How can I get the add-on "Push back"?
Review by jeffdez on Tank Battle: East Front 1943.