Windowed Slide Carriage With Piercing Tilt Mechanism

In this challenge the robot has to push the slide carriage to the right place - not too far, otherwise the window of the slide carriage will not open.

When the slide carriage is at the right place, the robot can push the rod through the window.

The robot is to push the rod so far through the window as to tilt the box on the other side. There is an element inserted loosely in the box. When that element falls out of the box and through the little gate, the robot has mastered the challenge completely.

Fixed elements are blue, moving parts are red, plus the sand coloured element in the box.