Complex sentence: A contestant who feels he/she cannot answer their remaining questions before all prizes fall may hit the "panic button" at the podium to reset the current round; the contestant then replays the level with a new category from the list.
Split into simpler sentences: A contestant who feels he or she cannot answer the remaining questions before all prizes fall may hit the "panic button" at the podium to reset the current round. The contestant then replays the level with a new category from the list.