To effectively teach computer science students the internals of a RISC processor, an adequate MIPS32 simulator is a valuable tool. MIPSter32 is a simulator that is both compatible with MIPS32 and provides visual controls of the simulation process. Takes compiled MIPS32 program, and simulates the execution of the program instructions in the pipelined architecture of the processor. The GUI allows the user to observe the execution state of instructions in the multiple stages of the pipeline, and inspect the content of the processor registers and main memory. The GUI also offers controls for a stepwise execution of the program. MIPSter32 is internally designed to support future extensions.