Sliding Piece Puzzles - Different sizes of pieces make these puzzles much more difficult than regular sliding puzzles. 9 Piece Puzzle - Put together the Boston University logo (Java). Absolute Lines - Challenging online puzzle game on a checkerboard. Boxcar Blockade - A sliding box puzzle game with hundreds of challenging computer-generated levels. kibuR's Fifteen - Double sided sliding puzzle. You cannot slide individual squares. Instead, you move squares by sliding rows and columns of squares at the same time. OmniSlide - Online slide puzzle which has no empty space. Instead, the pieces wrap around when the entire row or column is moved. Also available for download and placement on web pages. Nick Baxter's Sliding Block Puzzles - Offers photos and a Java applet to play rare and collectable sliding block puzzle designs online. Moving Grid - Hover your mouse over the cells of a non-uniform grid to try and reveal the quote underneath the tiles.