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We can hack the Android version to drop the price of elements to near-free.
To do this:
java -jar testsign.jar hacked.zip ready-to-install.apk
All the elements should now cost just 3 mana, so head to the element store and unlock them all.
On my Nexus 7, the hacked version of the game didn't have sound for some reason and I saw a few glitches.
To fix this, I just unlocked all the elements, backed up the profile data (/sdcard/Android/data/com.pixowl.thesandbox.android), uninstalled the hacked APK, installed the normal APK, then restored the profile data.
After re-launching the game, the unlocked profile remains with sound restored.
There is a guide to hack the iPhone version by editing rewards.plist, a file which exists in the Android version too, but making the change suggested in that guide had no effect, which is why I hit the shop.plist instead. Perhaps they left that file as a red herring?
Also, you may be tempted to try to edit the player profile.dat directly to change your mana, and you can find the binary number to do it (offset 0x94), but the file is hashed with a 160-bit hash (probably SHA-1), and the hash is salted or something, because I couldn't figure out how to re-sign it.