Let's pack the game!
For this tutorial let's take one of the Tutorial Projects that Unity provides, 2D Game Kit. Launch Unity, click on Download to the right of 2D Game Kit:
Unity loads the project files and opens the editor. Click on File - Build Settings to build the project:
In the Build Settings window that opens, select Compression Method - LZ4HC, this will reduce the size of the files:
After building Unity will open a folder with files. There are a lot of them!
To verify that everything is in order, run the New Unity Project.exe:
Run BoxedApp Packer, click on Select - Browse..., select New Unity Project.exe. Next, add the remaining files that are required by the game. To do this, click on Add File, select the files New Unity Project.exe, UnityCrashHandler32.exe, UnityPlayer.dll.
Then click on Import Directory and import the following folders: Mono and New Unity Project_Data:
To build the project, click on Build. Check that the packed game works as expected: