"Fortress" is the code name of a cancelled action role-playing video game that was in development by Grin. Director Ulf Andersson devised the concept for "Fortress" and pre-production began in the second half of 2008. During development, Square Enix approached the developer and proposed making the game a spin-off of "Final Fantasy XII". Grin reconceived the game in the recurring "Final Fantasy" world of Ivalice, and included elements of "Final Fantasy XII" such as stylistic motifs and character designs; additional elements included chocobos and other recurring creatures from the "Final Fantasy" series. It was to be released on the Microsoft Windows, PlayStation 3, and Xbox 360 platforms.