The phrase "bonus levels" refers to additional and extra stages or levels in a video game that players can unlock or access. These levels often offer more challenges or rewards beyond the main game. Full definition
It does, however, offer plenty of gameplay for your money, particularly with the inclusion of bonus levels that offer a slightly different challenge to the main game. (metacritic.com)
Complete special bonus objectives in a level and you may unlock bonus levels. (gamespace.com)
It is possible that there are different bonus levels for different targeted offers, but we have not heard of anyone receiving an offer that differs from what we have detailed above. (upgradedpoints.com)