Generally, to dream about playing Truth-or-Dare symbolizes issues of self-acceptance. You need to work on liking yourself more, and presenting the same, honest front to everyone, instead of trying to act how different people expect you to.
Some more specific meanings: If you were challenged to tell the Truth in your dream, you may be feeling guilty about something.
If someone else got a Truth challenge, especially if you doubt the truth of their answer in your dream, you are having suspicions about a particular person, relationship or situation in real life.
If you got a Dare, be extra careful to avoid offending influential people.
Think everything over twice and don’t speak unless it’s necessary! If you were the one doing the daring in your dream, you can expect someone of the opposite sex to give you a tough time.