The gravitationally-driven evolution of cold dark matter dominates the formation of structure in the Universe over a wide range of length scales. While the longest scales can be treated by perturbation theory, a fully quantitative understanding of nonlinear effects requires the application of large-scale particle simulation methods. In this talk, I will discuss and compare results from several N-body codes with different algorithms ranging from pure PM, over AMR and tree-algorithms to mixed methods. I will discuss different test problems and a diverse set of diagnostics, focusing on a medium resolution regime. Exactly the same particle initial conditions were given to all codes, allowing the identification of systematic differences between code results
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