The game was created by Greg Lieberman and can be found here: http://www.kwarp.com/portfolio/grammarninja.html
There are three levels to try - Beginner, Skilled, and Master. The basis of the game is simple part of speech recognition. The students are given a sentence and told to find a certain part of speech. Lieberman is even nice enough to give the number in that sentence and provides a ? box that gives a definition of what that part of speech does. Students find the part of speech by throwing ninja stars at it.
Since they are in training to be ninjas, they must be fast, so the score is their time (plus 5 seconds for each wrong answer).
A complaint might be that the sentences stay the same, but to counter that, Lieberman has the part of speech change each time you run through the game. The other complaint I've had from students is that it doesn't count pronouns as nouns.
Ways to incorporate it in the classroom?
1. As a grade - Make the assignment where you break down the time as a grade (for example, the time above may rate anywhere from a C to a D- or an F depending on the level of your students. Allow students to play it as many times as they want to get the time they desire. Then students can send you a screen shot or just bring their laptop to you.
2. As a distraction - Not going to be present and you are concerned that you haven't given enough work to keep them busy, but are hesitant to give a busy work worksheet or you need something to keep the students busy while you conference with students or give time for students to make up work. Set a challenge time and then offer some reward for those bright enough to meet the challenge.
3. As a class game - put this bad boy up on the SmartBoard (or whatever your device brand is) and let students come up for a challenge.
Why let all the students have the fun? I'm challenging you on the Master Level to beat my time: