I figure there are some old Talisman nerds on this forum, so thought I'd post.
This goes on Humble Bundles every so often, so it isnt such a big deal that the Talisman Digital Edition is 90% off on Steam right now. What /is/ a big deal, is that you can get the DLC (including the Season Pass to all future DLC) for 70% off.
http://store.steampowered.com/app/247000/What's this about, you ask? Glad you did.
http://boardgamegeek.com/wiki/page/Talisman_seriesTalisman is a GW boardgame from the 80s. There is no card collecting or deck building, Games Workshop probably wishes they had thought up those money making schemes but this predates all that nonsense.
It is your basic "competative quest" sort of thing, where each player is trying to reach the magical artifact. You might cooperate when it is convenient, but only one player can win. You can use a lot of tactics, and better players will win more often, but there is a lot of randomness in the cards and in the dice turn things around in an instant. Someone with a commanding lead might find themselves turned into a slimy little toad, or having all their strength drained or armor dissolved, or any number of awful things. The game can turn on a dime, and if you don't think Losing is Fun, then you probably shouldn't play.
But how do you play? Draw a character and travel around a board experiencing events and interacting with various squares and other characters until you are strong enough to venture into the middle region, where things get a little harder. Once you meet the requirements, you can open the Portal of Power and enter the inner region, where you have to be pretty strong and well prepared to make it through and seize control of the Crown of Command, which you use to win the game.
That is it in a nutshell. The game has had various editions. Second edition build upon and refined 1st ed, adding some board expansions to make the game a little larger. Third edition strayed from the original rules a bit and was not as well received.
Fourth edition is made by Fantasy Flight Games, and is pretty true to 1st/2nd edition. They support the game well, and expansions keep coming out. The Digital Edition is a pretty faithful copy of 4th ed, and they are releasing all of the same expansions as DLC (hence the value of the Season Pass).
Expansions, you say? Indeed. A plethora of additional and horribly unbalanced characters (don't worry, you draw them randomly and even the weakest of them can win in hilarious ways) as well as extra rules and more cards, items, events, spells, and such. Also, major board expansions. Large corner pieces such as City, Forrest, Dungeon, and Mountains that probably more than double the playing area and add a bunch more to the game.
Currently the major board expansions available in the Digital Edition are Mountains and Dungeon, I think City is up next.
The rules are convoluted and complex! so it can be frustrating to play, and probably a nightmare to program! There are a few bugs, but it is constantly updated with the new expansions and bugs are fixed all the time. Don't expect AAA polish, this is a small development studio. But it is a good game, and very true to the source.