Hello there.

Unity Engine
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1

Hello there. It may be simple but I have a big problem for me. The sound I added in the background of my game that I designed as unity 2D is not playing. what could be the reason I tried both wav and mp3 sound is not coming out.

2

Hi, really vague description of the problem.
The problem isn’t in the audio format since unity supports both .mp3 and .wav files.
The object playing your background music should look something like this.

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