what does difficulty mean?

[TomorrowIsAnOtherDay]

In change_mode API description. difficulty is 2.

#Change model parameters. Your solution will be graded in the environment with difficulty = 2, prosthetic = True and model = 3D, 

but in augment description, difficulty is not used for other values except 0.

#difficulty - For the 3D model: 0 - go forward at 3 meters per second, (other values not used for now)

Is it correct to use 2 as difficulty in grade environment?

[kidzik]

The difficulty parameter is not used yet, it will be used in the second round. For now, each difficulty value gives the same environment.

[TomorrowIsAnOtherDay]

Thanks