A modular floor tile is disclosed having a top surface. A plurality of edge surfaces defines a perimeter about the top surface and a support system is disposed at least partially beneath the top surface. A locking system allows for flexible displacement of a laterally extending protrusion having a flexible wall while placing a downward facing protrusion therein and/or allows for flexible displacement of the flexible walls of a downward facing protrusion while placing said downward facing protrusion into the laterally extending protrusion.