
WWTBAMillionaire is one good example - the trick is in carefully choosing the 3 WRONG answers so that they'll remind you, whether playing it yourself or with classmates (great tool for collaborative revision!!).
There are multiple Ppt templates - try searching 'gameshow name powerpoint template' yourself to find, experiment with others. You can DL the Millionaire template we'll use in lessons here - the same site has more gameshow templates like Jeopardy and The Weakest Link you could try too. The Excel template is linked in the Ppt.