Sokoball of Osaka is a box-pushing puzzle game based on the same concept as Sokoban but with many additional elements like moving floors, switchable obstacles and other hazards that make the game a lot more complex. Author Jim Radcliffe distributed Sokoball of Osaka as shareware. The game included several pre-made levels and a demo of the level editor, which allowed to save user levels but not add the new features into them - this was only reserved for registered users. So levels created with the unregistered version were more like original Sokoban puzzles. Eventually Sokoban fans asked Jim Radcliffe to create a more traditional style game with the same graphics, and supplied their levels for that version, which became Sokoban 1994.