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I'm sorry about that, the audio cues are the only hint on where the object might be hidden, when it beeps faster it means you are over the object. I should have perhaps made a more informative tutorial. 

Thanks you, your game was one of the few I finished from start to finish, much better balanced than mine is. 

yeah, I saw your project too, it seems like we may have made the same mistake of making it too ambitious. I also cut like maybe 70% of the original plan. I just ended up spending all my time in bug fixing the metal detecting system, making sure the audio plays correctly etc.  You seemed to have got a lot more done than I did though, so well done.