Cheat Code
Before the tutorial ends, there will be a monk that will ask if you have a code to enter. Enter tkrwzp as a code to get 10,000 extra gold, 300 starting flags, and 500 extra food after tutorial ends.
Food
Food is the most important resource in the game because it is what you use to gain levels. Everytime you gain enough experience to move up a level it cost's 80 food so the 200 food actually is very valuable. It is also the only thing in the game that costs real money if you want to buy it but you can get food in game through trading and or selling also so it isn't like you are forced to spend real cash to play.
Get 1,000 Gold
Go to Profile, click the red arrow on the top-right corner of the screen, then Update Status and enter 'aemdt'. Note that this code can only be used once.
More Crystal/Oil extra accounts
Use Titanium Backup!
Load Titanium Backup, wipe the PK app data then change the andoid ID.
Load pk, and make another account. play as much as you want, make huts, wells etc.
Exit pk, load Titanium backup again, wipe, and change anddoid id again.
Make sure you set the harvest cost to 0 or what ever you want, and give your main passage.
Do this as many time as you like, then wipe and change a last time and use you main account.
Now go tend your crystal farm!
Cheat Code...