Hi, I know your post was a few months back but hopefully you're further along now. I've found a good way of earning energy for free so I can do all the challenges. Firstly I bought the mascot that gives double EP points(so now I get 4 energy for an albatross and 2 for an eagle) then I play hole 18 on figi and I can normally hit an albatross or an eagle every time, then I just keep replaying til I have enough energy to do the next 9/18 holes challenge. To do it in 2 shots you need to hit the treasure chest(on this level it's usually next to a rock before the wall, if not there it could be behind a tree on the right on the 2nd section-both can be hit from the tee meaning you make the green in 1 shot, I also buy loads of balls that stop wind this helps me hit the treasure chest each time . It always puts you in the same place on the green it's a long put, but you can do it it's usually straight-slightly downhill tho so don't put full speed just under the line is fine. Also I have quite good stats power103, accuracy 50, putting 60-recovery is low 30. To get these I buy the power club(red) and the Tarzan outfit its 12 grand on level 40.
Following this strategy you can make enough energy for an 18 hole challenge easily I average 8/10 either 2 or 4 energy back.
Sorry for the massive post, hope this helps, I love this game I think it's great and now I don't have to worry about energy it's even better
