a daily mission has 3 parts. low tiers,middle tiers and high tiers..
most of the missions in low tiers are harder to complete than high tiers (sometimes impossible) but it's must be easier .
for example : kill the required number of bombers in an attack flight.
I played +20 battles tier 4, and no map with command centers !
and ex: make 10,000 Exp (not sure about the value) while you doing GT ...in high tiers it's too easy and in low tier you need +20 battles maybe more , sometimes it must be victory to be counted .
yeah, I know I can skip and change the missions, I did but It's replace with a completed mission ! what a f***ing bug .
I like to ask the designer, why ??