What is the most complicated game ever?

Haha, I know that's not an easy question to answer, but I love exploring high level chess games and I'm interested if anyone has any suggestions for really complex, tactical games. I'm looking for lots of threats, lots of attacks, and tons of depth and lines to explore. 

Also, does anyone know how I can get Deep Fritz, Rybka, or Houndini, possibly for free?  

Houndini: Dog Magician

// Like you requested, it's free!

The game in post #4 was voted one of the two greatest games ever played (along with Botvinnik-Capablanca, AVRO) in several places. Not sure if it's really the most complex, but it certainly amazing.

Kasparov - Topalov, don't know the Event, 1999.

It's considered Kasparov's best game ever.  It was a Pirc Defense.

Wijk Aan Zee-Hoogovens'

EDIT missed that post 4 tells the event name. Eh.

12 minutes after socialista posted the game? You're not sure of the event?

Anand - Topalov Mtel Masters 2005. The game is drawn but it is known as 23rd Century Chess because of the complications.

Note that I posted it during the day, during the week.  Where I am during the day, during the week, boards don't render and load because of a firewall, so I have no idea which two games are listed in posts 3 and 4, so I simply responded with what I find to be one of the most complex games I've seen prior.

Tal would certainly have games that qualify as very difficult, this next one is a gem of history. Though one can prove quite easily that Judits many sacrifices loose by a little over two whole points using a computer, the position is not so easy for a human as there are many positional attacks going on, including pins and tactical advantages. 

http://www.chess.com/groups/forumview/judit-polgar-vs-viswanathan-anand

Another (I'm assuming the diagrams don't include this one) is Sutovsky - Naiditsch, Wijk aan Zee II, 2010, Round 8

I would assume there are correspondence games which may eclipse some of these games

Nice and amazing games!

Probably we can find games like that played with the 2 knights defense.

Bronstein-Panno, Petropolis IZ, 1973 is a good one for this thread.

Petrosian-Fischer, 6th match game, 1971 was good, too--Najdorf's comment on the adjurned position: "It's as difficult for white to draw as it is for black to win."

Most complicated game ever?

Rock, paper,scissors!