Contests are a great way to challenge oneself, showcase talents, and win exciting prizes. However, not all contests are the same, and using synonyms can help you broaden your horizons when it comes to participating in them. Some possible alternatives to the phrase "certain contests" could include specific competitions, selected challenges, definite battles, particular matches, fixed tournaments, or established games. Each of these options conveys a slightly different nuance or tone, which could help you better tailor your participation and approach to the context and rules of the contest. Putting yourself out there and trying new things is always rewarding, so don't be afraid to experiment with different types of contests and see what works best for you.