Hi Nidhi,
when we had similar event in our company i played the coin game. Rules are:
1. Make each participant sit in a circle
2. You can start clockwise.
3. One person will start the game and will toss the coin.
4. If head comes person has to state a statement which is true about himself and it tales he has to say something which is not true about himself.
5. The game is the next person to whom he popped a question has to guess weather the statement he quoted is true or false.
6. The statements which the person states has to be related to himself or his life. For eg they can ask questions about their likes or dislikes, about any event happened before in their life, etc
7. If the person guesses it right will stay else is out from the game.
8. And like that game continues till we have one person left.
Well this game is one of the ice breakers but its a lot fun even when group of people know themselves. We played this game in out monthly event and it lasted for about an hour though number of people were only 10.