A modular floor tile having interlocking members which are reinforced to prevent a gap from forming between adjacent tiles during use. The tile comprises a plastic support grid having a rectangular configuration bounded by a perimeter wall on four sides and including a latticework of support members on the underside thereof. The support members are integrally formed as part of the tile and include leg portions extending downwardly therefrom which have common lengths in order to provide a single plane of contact at the supporting floor. Interlock members are coupled to and extend outward from the perimeter wall to enable removable attachment of additional modular tiles of similar design at corresponding edges thereof. A continuous sheet of plastic can be integrally formed in uniform thickness with a top surface of the tile to provide a flat surface on which recreational games can be played on an interlocked grid of tiles.