## boomshakalaka (mobile, 3 points)	play the game, get the highest score
[boomshakalaka](plane.apk)
We're given an android apk, after decompiling it, we learned that our flag is stored in Cocos2dxPrefsFile.xml in shared_prefs folder.When we looked in the specified file, it turned out that the flag is only partially complete: 
`0ctf{C0coS2d_AnDro1d_G7s÷ضg´3?6ُ3&Eô?نG&َ`
After a while of searching, we find out that the rest of our flag mechanics is actually compiled in the `libcocos2dcpp.so` library.At first, we only noticed one check for score that displayed "Look at your xml file":
![fail1](fail1.png)
So we tried setting the score manually with some game-cheating applications, which gave us some promising results:
![fail2](fail2.png)
But it turned out that it wasn't enough, the flag was still not complete.Finally, after spending some more time on it, we discovered checks for various numbers of points.
Example:
```c++case 0xBB8:	v11 = cocos2d::CCUserDefault::sharedUserDefault(v4, v5, 3000);	std::operator+<char,std::char_traits<char>,std::allocator<char>>((int)&v26, (int *)&v21, "Bt");	cocos2d::CCUserDefault::setStringForKey(v11, (int)&v35, (int)&v26);	v8 = &v2;;	break;````Joining all of the strings together, finally gave us the valid flag:
`0ctf{C0coS2d_AnDro1d_G0mE_YoU_Kn0w?}`