I want to buy another LEGO Technic set therefore I'm trying to analyze the challenge to price ratio of different sets. I first thought that the part count may be somewhat proportional to challenge and fun of building but the winner of this category is the 42069 set (extreme adventure) and this set seems to have a lot of tread parts which probably are included in the part count on the box so I was wondering if there is the "real part" count somewhere so my calculations are more accurate or maybe there are some reviews that include numerical fun factors or challenge factors that I can compare to price.
The "realest" of the real part count for any piece is always located somewhere in the back of the instruction booklet piece manifest.
Look at middle row last piece bottom, where it says we're gonna need 108x 6014648.
Wow, this thing looks cool! Have fun!!
Source: LEGO instructions - Technic - 42069 - Extreme Adventure (Model 1) by LEGO instructions - Fan - Site.