Both modes contain three levels of racing difficulty (Classes C, B, and A), each of which must be won in order to unlock the next, beginning with Class C. Each difficulty level features specific variations on the Gran Canaria circuit, as well as a garage of eligible cars. In addition to the progression levels, ROC racing offers eight other challenge modes: duel, rally, circuit, rally cross, driving, hill climb, elimination, and follow-the-leader. Most of these award trophies for winning and performing in special circumstances. The ROC mode also includes 14 Quick Race options, including time trials, relay modes, checkpoints, and more.

Courses in Rally Fusion: Race of Champions range from parallel tracks to hostile environments, including locales such as Gran Canaria, Desert Heat, Arctica, Inca, Oceana, Canyon Fire, Alpine Climb, Metro, and Motordome. More than 30 professional world-class drivers from rally events and motorcycle and car racing are available at various stages through the three levels of difficulty.

Class C vehicles include both classic rally and modern kit cars such as the Ford Escort Mk1, Opel Kadett, and Toyota RAV 4, while Class B cars consist of ROC favorites like the Ford Escort RS Cosworth, Toyota Celica GT4 and Corolla, Peugeot 306, and Lancia Delta Integrate, among others. Cars in Class A, such as the Lancia Stratos, Saab 93 Turbo 4×4, Audi Quatro S1, and Opel Manta, to name a few, have been deemed too powerful to compete in major rally championships but are offered as a reward for winning C and B class races in Rally Fusion.