Talk:Endurance Kings/@comment-174.69.62.121-20170617193912/@comment-174.69.62.121-20170617195053

...and

"All tiers and 89% completion can be reached without   upgrades."

the last sentence in the 'introduction' before the beginning of list of tables is not true anymore since the devs (developers) are forcing players to use expensive Gold upgrades in the early stages of upgrading, for example upgrading from stage 2 out of say 5 of an engine will require you to spend say 100+ gold to reach stage 3 out of 5 and then after that R$ until upgrading from 4 to 5 (maxing out the engine).