In the following model of corruption, a simple game is set up whose players are a government official granting a permit, conditional on a test, and a candidate requesting the permit. The game is solved under different assumptions as to the information sets of the players: perfect information, asymmetric information and imperfect information on both sides. In the latter case, after characterizing the solution and presenting some important comparative-statics results, the paper moves on to show the emergence of multiple equilibria in corruption, illustrating the interaction of corruption at different hierarchical levels of an administration.