There was an annual fair in my school in which all students could present their projects. It was a great motivation to explore new ideas and innovate cool stuff!
As we learned a lot from our advanced line follower robot, we decided to use our experience in that project and design a game. Our idea was to create a shooting simulator game. So, we started by embedding a laser in a toy gun. We then designed a box with an archery target on one side. We also put an IP camera inside the box to capture video and process it with pc.
The trigger in our toy gun was connected to a small electronic board. So, whenever a user was trying to shoot, we could score his accuracy based on the position of the laser spot.
Here is a video that demonstrates this: