Collect the Letters by moving the single/double (vertical) cubes onto the letter. Put the cubes into the holes (blueish Tiles) carefully to form a legitimate word. You can reset any level by pressing the Reset button anytime. Use the HINT button if you can't guess the correct word. Use the Switch to open/close the bridge. Double cubes must stand vertically on the switch to activate/deactivate the bridge.
Use Arrow Keys to move the cube. Press Space or Use Left Click to select the cube. Use the Numeric keys (1-6) to rotate the scene in 3d!