Lady Sia 3D is a prototype for an action adventure game that was in development by RFX Interactive in 2002 / 2003, for the GameCube and Playstation 2. The game was meant to be a tridimensional sequel to the original Lady Sia, created by RFX and published in 2001 by TDK Mediactive for the GameBoy Advance.
This Lady Sia 3D prototype never evolved into a full game and it’s possible that the team found it too difficult to translate the fun gameplay of the original GBA version into a 3D world (before this proto they only worked on 2D games for the GBC and GBA). In 2003 RFX closed and TDK Mediactive was acquired by Take-Two Interactive.
Thanks to Holly for the contribution! Thanks to Jason for the english corrections!