Right Left Up Down Reverse

Gliding the arrows that are solid requires going in a certain direction, while gliding the dotted ones requires moving in an opposite direction. Does it seem simple? It may be easy to engage with, but challenging to excel at.
Gliding the bold arrows uniformly, and manoeuvring the dashed arrows in a contrasting direction. Appears facile? It may be uncomplicated to commence, but it is challenging to excel.

Glissez dans la direction indiquée par la flèche, ou bien dans la direction opposée si la flèche est rayée.