Thuluth is an innovative, mosaic-inspired board game designed to enrich Arabic vocabulary and engage learners with the structural beauty of the Arabic language. The name Thuluth (الثلث), referring to the common three-letter root system in Arabic and to a classical cursive calligraphic style, reflects the game’s dual foundation in language and art. The game combines visual creativity, logic, and linguistic exploration and is suitable for players of all proficiency levels—from absolute beginners to native speakers. The game is played by filling a triangular board with Arabic letters, creating meaningful three-letter roots in every triangular cluster. Players earn points for each valid root, encouraging quick thinking, word analysis, and playful competition.