you can find a demo video.
The correct is 'short answer' no 'simple answer'.
Try to get the latest version of module Game (for questions). In a previous version was a bug with questions.
For multiple choice answer you have to fill the following fields:
a. Question name
b. Question text
c. Choice1.Answer, Grade
d. Choice2.Answer, Grade
The module uses the answer with the bigger grade as correct.
To change the parameters of a running game you have to:
a. Go to "Update this Game"
b. Change the parameters you want
c. Press the "Save changes" button
d. Go again to "Update this Game"
e. Go to list of instances ( the list with columns Delete, User, IP student, ...) and press the X button on each line with running game.
If you want more info please tell me.
You can help us to documentate the module Game. The documentation is at http://docs.moodle.org/en/Game_module