havent read all the comments yet but the answer is always a multiple of 9, at least the guy was smart enough to change the symbols around each game that confused me for a while. 4/5 for thinking it up.
great game finally got all the achievements the time of 6 was pretty hard but when i got it i had a time of like 97.5 so i had a little time to spare. 5/5
pretty good game its kind of frustrating though how the cogs only fit in certain ways and it doesnt seem to work in the places they should fit. Also the cogs shouldnt fall to bottom when you let go of mouse because they fall into the selection space. Still good game my score is currently $6843
havent finished yet but some of the country missions are complete luck like the water jump where you cant win unless the truck lands on randomly placed mines