The G3ODE is a mind-bending software-based puzzle with a 3D graphical interface.
The puzzle is a polyhedron with tiles covering all facets but one. Each tile has two distinctively coloured sides. Any of the 3 tiles adjacent to the empty facet can be flipped into that space. In colour-only mode, the puzzle is solved when all tiles are flipped such that the surface of the puzzle is all one colour. In decal mode, similar to a jigsaw, the puzzle is solved when all tiles are arranged such that the image is reconstituted on the surface of the puzzle.