Lots of old DOS games do not contain proper synchronization code, and run extremely fast under higher speed processors. What are the rules regarding such games?
Your question is answered at this page, though not linked from anywhere:
More information about the topic can be found on that page.
Note that these rules are only conceptual: DOSBox submissions are not accepted on this site, because they are usually not playable on any other computer than which they were made on... For reasons unknown yet.