A toy brick, a method of manufacturing a toy brick and a mould formanufacturing a toy brick. The toy brick comprising: a body part with one ormoresidewalls extending around the outer periphery of the toy brick. The sidewallsat leastpartially define an interior of the toy brick and said sidewalls extend from abottomface to a top portion of the body part, an elongated rib arranged interiorlyon one ofthe sidewalls. The elongated rib extends between the bottom face towards thetopportion of the body with the other toy brick, the width of the elongated rib,in a centralportion, is greater than the width of the elongated rib near its ends parallelto thesidewall accommodating the elongated rib.
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