Mutual Mobile Android Intern interview questions

The recruiter directly contacted me via a call. The recruiter asked some basic questions like what is MVVM, have you worked in Kotlin, etc. The second round was after 1 weeks approx. They asked me basic android stuff like activity life cycle, design patterns, etc. The last round was after 2 weeks. They asked me to make a n*n TicTacToe game on android. I had a hard time implementing it. They asked for my code, I still had hope. Then the next day they mailed me saying you are rejected.