Games and playfulness are serious tools for architects and urban designers. ‘Serious Fun’ dives into games conceived and created by architects, urban designers, artists, and game developers since the end of the 20th century. The games are examined from both a game technical and an architectural critical point of view, where as much attention is paid to the games themselves as it is to playing them; and in particular, to the space that players either receive or take for their personal, spontaneous, unexpected, and subversive moves and ideas. The book concludes a trilogy about alternative forms of representation and communication in architecture and urban design. Cover image by Zupagrafika.