3D-Slider puzzle for Windows, OSX, & linux--all distros: RufasCube is NOT another Rubic's Cube. It's a whole new kind of puzzle. A 3x3x3 arrangement of cubelets with the center one missing allows sliding permutations. After a randomization, the goal is to restore the cube to its original configuration based on color and alphabetic hints. Dragging the cursor rotates the cube for a better view angle. Clicking the cursor on a cubelet adjacent to the empty space will slide it into that empty space. On laptops you may also hit <return> when the cursor is on the cubelet of choice to select and slide it. On MacBooks, a 2-finger tap on the touchpad does the job. As indicated on screen, <h> will toggle a help screen. New linux build allows multi-distro portability with a single executable.