u probably see a handful of people getting these 700 or 800 scores, but u forget there are an awful lot who arent getting them too.

it all boils down to luck... i spend on average 35 gems in each lab i do buying extra change or skip options, still it comes down to luck in the end tho.....lots n lots of times i come up just short, but i do get a minimum of 2x700 lab runs each day...and around 1-2 times per week an 800 score. of course it is easier to get higher score on 'hard' labs than what it is for 'easy' ones - there are more 20 point tiles to be found in increased difficulty levels.

So basically there is no real secret....just gotta cross fingers n toes n hope for the best.....