When I say kids I mean around 8 years old. Trust me, I'd know, I have an eight year old brother who loves games like LEGO Minifigures Online, yet sometimes finds games such as the ones you just posted difficult. I'm not just making stuff up 'cause I feel like it. :/
And I know better than most that kids aren't as dumb as people think. My youngest sister was talking in fully legible sentences and mostly proper English by the time she was two.