its a scam not a game . the amount of gems it cost to upgrade planes is ridiculous. you have to spend excess amount of gems to upgrade each tier of plane not to mention the amount of gems you have to spend on gears to better your plane or the excess amount of gems you have to upgrade on your wingman lol its crazy .oh and it cost you gems to merge your planes from t1 to t2 . start playing with t1 planes in 1945 . still using those t1 planes in 2022 only another 20k gems to go before t2