Talk:Technology/@comment-6072730-20140819033103

In lvl 90 you get the ability to use "Lucky Strike" which can double the output of the item you are tapping.

¤ If it is an energy/tech crystal you will get double (i.e. 16/20 - without bonuses). ¤ If it is a gold brick you will get double the gold from it ¤ If it is a super hard rock it will make it disappear in one go. ¤ If it is a normal block you can get double the clear rewards from it (got 4 energy from one)

I always use the half-energy cost backpack, so it costs 8 Tech to use (I assume it is 16 full use). But it means that every time I use it on a tech crystal I spend 8 to get 20, giving me a bonus of 12 Tech per strike. Without the backpack you would be spending 16 Tech to get 20 so a profit of 4, so you should always use Lucky Strike on Tech blocks