It was recently brought to my attention that an artist/game developer was bringing his own unique brand of physical gaming into the world. Rather that just create a project and move on he decided to start a Kickstarter campaign to try and get this project moving a little faster (if he could turn a profit, I'm sure nobody would be crying).
If you've ever played a Tower Defense game you get the general scheme of things here. Create a path, setup towers, enemies approach your defense system and wipe you out as they exit the screen. Doodle Defense takes the tried and true formula and just changes the medium you play it in. Rather than using your fingers or a mouse you use dry erase markers on a whiteboard. If you are interested in the tech that powers this game, good on you, it isn't very interesting.
The demonstration videos and photos aren't very clear or useful, but here's what I could glean from it. You have to use a red, blue, green, and black marker so you'll have to make sure you have a package of all four color dry erase markers. I saw that at least two different types of markers were used, both Quartet dry erase markers and Sanford Expo dry erase markers. I couldn't tell what kind of whiteboards were used. I couldn't see the brand or attempt to divine the size of the boards. I assume it'll all depend on how close you keep your projector to the board. The source code for the game is available if you want to try to build your own rig, but that's too much effort for me.
So I just went looking to see if any other whiteboard games were available and found Whiteboard Tower Defense.
This is really just a standard Tower Defense game and the only reason that "whiteboard" is in the name is to excuse the poor art quality in my opinion. You can see in the screenshot that somebody took a photo of the whiteboard in their office and used that as the backdrop for the game. They even left the Quartet logo in place on this game's backdrop so you know they have a Quartet whiteboard.
I doubt that Quartet officially sanctioned this game, but whatever. That's for the lawyers to fight about.