While surfing the list of Orkut Apps available I came across over a dozen (or two) high quality programs, with a large number of them falling into the "gaming category."
Of those, here are a few games that users may enjoy--although I would not recommend playing them at work (as they may not only suck up all of your time, but they could get you fired as well).
Simply called the McDonald's Video Game, this Orkut app does an excellent job of teaching users how to "successfully" run a McDonald's restaurant--all the while making fun of the corporate giant.
The game is powered by Molleindustria, which has a strange taste in developing games that tends to "push the limits" as far as social norms go (as one can easily see in this example).
While the game does actually use humor to teach a user about how to run a business (so you could at least argue that its educational), I would not be surprised if Google removed this app in order to avoid being sued by McDonalds.
Users can grab it (while it is still available) over here.
For those of you unfamiliar with Sonic the Hedgehog, this was one of the "hot" video games when I was kid, surpassed only by Mario (which is also ironically on Orkut as well).
The app comes in both English and Portugese, and also allows users to adjust the screen size (not to mention chat as they play). Users can also select other video games ranging from Tetris to Duck Hunt to even Mario as well. :-)
The Orkut app seems to be powered by Menace.ch (which is under construction) and users can grab the Orkut app over here.
For those of you who prefer to play games with their friends (or even strangers) then you may want to check out Come2Play, which has almost 20 different games ranging from Checkers, to Sudoku, to Reversi (note: one of my personal favorites) to even Chess (pictured below).
One of the cool things I enjoy about Come2Play's Orkut apps is that you only need to install one of their apps in order to have access to the rest, which means users do not have to worry about going over the 25 Orkut app limit established by Google.
These are only a few of the games I came across on Orkut, and if you have found any others worthy of mention, be sure to let us all know in the comment section below!