The phrase "Kids before adults" means that children should be given priority over grown-ups in certain situations, such as receiving help or resources first. Full definition
Honestly, it's so lukewarm and toothless that it seems as though Majin is aimed more at kids than that adults — and in that context it makes a little more sense, except that I would imagine some of the puzzles to be a little too vague and the bosses a little too frustrating for most kids to get through without some skilled parental guidance. (gamecritics.com)