You should clear all three missions on every mission set to proceed on the next mission set.
Finishing mission gives coins as a reward.
You can use coins and mechs to finished very hard missions.
Puppet Punch Cheats
Use any hex editor apps that are available for android/iPad/iPhone and change the value of HEX Dword to any amount you want.
Mech Coins HEX 33 db a9 31 Dword
If the codes doesn't work, it is possible that your android/iOS version is not compatible with the code I provided above.
Fortunately you can do it manually! To do it manually, just use search function in your hex editor app, enter your current Mech Coins value in Puppet Punch and search for it (choose DWORD) .
If you see a small list of results, example 10. Just edit the value of them one by one until you can find the real HEX!
If you see a large list of results, you need to change the value of current Mech Coins value in Puppet Punch by either consuming them or adding them. Go back to the list and find your new current Mech Coins value in Puppet Punch to the large list and finally you can edit the value.
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