In standard residential electrical design, 3-way switches are installed in pairs whenever you need to control a single lighting load from two distinct locations, such as at the top and bottom of a staircase, at opposite ends of a long hallway, or at two entry doors of a large room. If you need to control a light from three or more separate locations, you cannot use standard 3-way switches; instead, you must install one 3-way switch at each end of the run and one or more 4-way switches in between. You can troubleshoot lighting layouts easily by counting entry points. You can verify that your corrective action is successful when pairing the correct number of switches ensures seamless lighting control from every desired doorway.
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