Astulae, the roleplaying game of alternate realities megadungeon, is now on sale at DriveThruRPG and RPGNow.com until 12/Jan/2015.
Here's what one reviewer said:
I found this game to be very intriguing and the concepts contained within to be new and fresh. The idea of parallel dimensions is not a new one, but there are enough unique aspects of this RPG to make this feel new, in particular the effect of magic and technology between the dimensions. The book itself has a huge amount of information for a GM to create some awesome adventures for their players. I like the fact that it does not tie a GM down to any particular play scheme, however there will inevitably be some work for a GM to do in mapping across thing such as player classes etc, to the classes described in the book. This would be no small undertaking for any GM, although in the appendix it does give an example game system to use. However I feel that this is also it's greatest strength and will allow great flexibility for adventuring.
This is the cheapest it'll be for some time, and an expansion has already been penned and will be released in a few weeks time! Hope you enjoy!