1-2-3 Build It - Train/Rocket/Helicopter by Learning Resources1 2 3 Build It Train Rocket Helicopter Three building sets in one! Kids develop early engineering skills as they build a rocket, train, and helicopter (one at a time) with mix and match pieces and a chunky play wrench. Multiple builds encourage critical thinking and extended play. Travel through land, sky and space! This 3 in 1 building set helps kids develop early engineering skills as they build a rocket, train, and helicopter (one at a time) with