A number of point masses are shot horizontally at various initial speeds and fall, due to the influence of gravity, onto a complex analytical rigid surface. The surface consists of line, circular, and parabolic segment types and includes several deep valleys to trap the point masses. The robustness of the global contact tracking algorithm is tested as ABAQUS/Explicit must correctly determine throughout the analysis which master segment interacts with each slave node. The time increment size is 0.5 s, which results in very large relative displacements for each point mass during each increment.