Having the "free" source code allows for extensive customization, though it comes with challenges: DDTank Origin for Android - Download the APK from Uptodown
If you manage to obtain the DDTank source code, here are some steps to get started: ddtank source code free
The primary challenge with free source code is the presence of bugs. Since these are not official releases, you may find that the combat physics are slightly off, or certain shop items cause the server to crash. The community plays a vital role here; many developers share "fixes" and SQL scripts to patch these vulnerabilities, making the game more stable for local play. Having the "free" source code allows for extensive