Game Progamming Algorithms and Techniques
By: Sanjay Madhav
This code is a sample tower defense game from my book. While the code contained herein does have some commenting, for a more comprehensive analysis of the code, you should read the corresponding chapter from the book (14).
For any updates to this code, more detailed build instructions, as well as download links to binaries, visit the page for this project on the book's website at: http://gamealgorithms.net/source-code/defense/.
There are three different solution files, depending on the platform:
defense-xna.sln - This is the XNA 4.0 version which works with Visual Studio 2010 only, and you have to have XNA installed.
defense-mono.sln - This is the MonoGame PC version. It will run on either Visual Studio 2010 or 2012, and requires MonoGame (tested with 3.0.1). It may also work in the MonoDevelop IDE.
defense-mac.sln - This is for MonoGame on Mac. It requires the free version of Xamarin Studio as well as MonoGame.
Almost all of the C# files are simply shared between the three projects. The only separate files are the Program*.cs files, which are just really simple entry point files. Also note that the Bloom post-process effect is only enabled in the XNA version, as there are some differences in how MonoGame handles effects.
The code is released under the Microsoft Permissilve License, which more or less means you can use it for whatever you want to, commerical or not.
Though not required, it would be nice if you gave attribution if you end up using this code in a game of yours. At the very least, I'd love to hear about any games that end up doing so.
I'm not a lawyer, though, so you'll want to read the full LICENSE file.