There's two reasons I can see as to why someone would want to do this:

1. To alter the game code and make mods. (Please read the disclaimer section concerning this, though.)

2. To compile the game with the free version of Unity and thus remove dynamic lighting, for a less-pretty but much-more-efficient version.

Originally posted by Readme:

See http://www.wolfire.com/receiver for more about this game. This repository is public for convenience and for personal use, but is not licensed for redistribution in whole or in part. We are open to issuing free permissive licenses for mods or code pieces, but you will just have to get our permission first ( contact@wolfire.com ), because we were burnt in the past by public confusion about open-source licensing. (See http://blog.wolfire.com/2011/02/Counterfeit-Lugaru-on-Apple-s-App-Store-developing for more about this). Thank you for understanding!

Does this mean that you can get a workable copy of the game at no cost? If I am understanding this properly, yes... but the method of doing so is very tedious. If one wanted the game for free, they'd be better off pirating it - not that I'm encouraging that! I'd rather everyone reading this actually buys it, since the mechanics of this game are amazing to me and I'd love to see more games being made with it at heart. So if you like what this game stands for - buy it! The only reason I'm making this guide is because many other players like myself can't even play it thanks to the FPS lag, and this method can remove the lighting that causes the problem and make it playable and testable.

First off, you need the actual source code, located here[github.com].

You'll also need Unity - either the free[unity3d.com] or paid version, depending on what you want to do. Either way, it's a hefty act to download and run it.

Install and open Unity, and extract the source code zip.

In the zip will be two folders: "assets" and "UnityProject". The folder "UnityProject" will be the one you'll want to import into Unity. This will take a fair deal of time - be patient.

Open Project > Open Other > [the folder to be imported]

If you're looking to mod the game, here's the point to where you go about doing so.

If you're using the free version of Unity and just want to get a game copy that won't lag a ton, then go right to Building.

This process should be straightforward. Be sure to choose the appropriate OS and such.

After building, it should make an EXE and a folder with assets. Just run the EXE to test it.

Hopefully everything works properly, as it did for me. I was able to play it with no lag whatsoever, although with quite a drop in lighting quality.

Remember - don't take the finished build and share it, sell it, or anything else - it's for personal use at most, without their permission at any rate. And again, if they're against my explanation on how to do this here, I'll gladly remove it. I'd hate to cause them to lose sales - but for many, like myself, not having this method means having an unplayable game.

Feedback is welcome. Especially if I made a mistake on the guide.