I just downloaded an app, it shows up with a circle with a sign through it and tells me it can't be opened?

I don't know why it isn't opening, I have searched everywhere for an answer and I don't know what to do, I've deleted it and re-downloaded it and I've changed the permissions on it but now I'm stuck

This is usually down to one of two reasons, either it is a very old application so old that it was written to run on PowerPC Macs and not Intel Macs, or it is a slightly less old application but still too old to run under Yosemite. It might possibly run under Mavericks or it might be too old for even that.
However I have checked and it seems that Lego Batman 3 Beyond Gotham, on the Steam Store it says it is recommended to use Yosemite which your message signature says you are running. On the Mac App Store it says it requires 10.8.5 or later. Where did you download it from? I can also see that on the Mac App Store the current version is listed as 1.0.4 and it appears you have 1.0. I can imagine that 1.0 is too old to run under Yosemite.
See http://store.steampowered.com/app/313690/
and https://itunes.apple.com/gb/app/lego-batman-3-beyond-gotham/id929205348?mt=12
You might also want to read this page http://www.feralinteractive.com/en/mac-games/legobatman3/links-requirements/
It seems you may need certain models of video card and to have your hard disk formatted in the standard manner which is case insensitive. If you have it formatted as case sensitive this is apparently not supported. What model Mac do you have? This would help us determine which video card you have.

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