Hi. I found one latvian test about DO, and for completing this test, they give you a voucher for one Lf-4.
But it is on strange languedge, I just always putted point on A and then pressed CONTINUE. I think you'll understand, when starts to complete it.
Hope I helped you. Forgeted to write this in the last message xD
am not sure if its fake but after i logon on that website it took me where it ask for email and pass, so my guess is that they get ur password and they know u play darkrobit on that email because you will not be intrested in lf4 anyway, idk if theres a way to check for fake websites please check and reply