Introducing to programming LEGO® MINDSTORMS® EV3

The program detects an object and stops before moving all four rotations.

The program doesn't run because it's waiting to detect something in order to run.

The Move Steering Block holds up the program, preventing it from checking other sensors in the mean time.

All of the above are valid reasons on why the program doesn't work.

The Wait Blocks prevents the flow from reaching the end of the loop and checking Rotation Sensors.

The program ends immediately when it detects an object, regardless of the Loop.

The Loop makes the robot go backwards.

The first Move Steering block only goes for one rotation, then ends the program.

Rapid checking of sensors.

Sensor recombination fork.

A new multiple-sensor Wait Block.

A new type of Loop Block.