맞히다 is hitting on the right answer, and -(이)라도 lowers the bar to a bare minimum: 하나라도 맞혀보자, 'let's at least get one'. Every line here comes from a quiz or game segment, usually about salvaging something from a losing round. Mind the spelling: 맞히다 is getting an answer right, while the similar-sounding 맞추다 is fitting or matching things together.