How to make GoPiGo go straight

I am exercising with mission 2 and my robot is not going straight when moving forward. How can I do it?

Hey matteo.cerrato,
We often recommend putting rubber bands on the wheels. It adds much better traction than the wheels you see there. It might help balance the rotation, if you put rubber bands on both wheels. Can you try that out and let us know if that helps. Can you also post a video of the GoPiGo turning .

-Karan