Final answer:
When it is discovered that a skater not listed on the scoresheet is participating in a game, the referee must act according to the rules, which often result in penalties for the offending team.
Step-by-step explanation:
If a skater who is not listed on the scoresheet participates in the game, the referee must take specific action according to the rules of the sport, typically ice hockey or a similar game. Though the exact ruling can vary depending on the league or governing body, in many cases, the referee is expected to stop the game and address the situation. The unlisted player is usually deemed ineligible to play, and depending on the rules, the team may receive a penalty, such as a minor penalty or even forfeiting the game.
The key points to remember are that the integrity of the game is of utmost importance, and all players must be correctly listed on the scoresheet to participate. Not doing so is a violation of the rules, which are in place to ensure fairness and transparency in the competition.