The objective of this paper is to elucidate the symbiotic relationship between critical design methodologies and the creative development of fantasy-themed virtual worlds. Employing Peircean semiotics as its theoretical framework, it examines the concepts of the imaginary, the real, and the symbolic within these methodologies. The imaginary domain functions as a dynamic playground for synthesizing intricate information into interactive realities, with both critical design and fantasy world-building employing metaphor and exaggeration to engage critically with contemporary issues while maintaining a resemblance to reality. Speculative design extrapolates towards projections of distant future realities, thereby offering reflections on our present shared reality, while fantasy world-building delves into parallel realms echoing elements of our own existence. The proliferation of video games, virtual reality, and the metaverse represents tangible manifestations of speculative design's dedication to immersive, intricately detailed environments, which synergistically complement the world-building process. Additionally, the online dimensions of virtual realms introduce novel avenues for social interaction, further enhancing the immersive experience. The principal objective of this study is to discern the shared conceptual tools employed by these methodologies and to acknowledge criticism as a fundamental element in the crafting of elaborate virtual worlds that transcend conventional perspectives, thus facilitating a comprehensive understanding.