I must advise NOT to buy the SP for TD,not for 39.90 nor for reduced price of 19.99 bcs its not worth @ all
on the other hand its quite easy to purchase the SP if u want it
open uplay client and go shop there u find it for 39.90
or u wait for a sale like we had some days ago where SP goes for 19.99
i own Underground and it bored me after a couple of Hrs,made it to lv 12 or such
after a few hrs u know every "Random" they have to offer.means all UG looks same
and since they took away the checkpoints,u loose all u invested if u die or ur Ult does not proc(solo)
but if u really wanna buy SP its not tht hard to purchase it through Uplay
sayonara