Block-N-Roll is the only patented horizontally integrated marble maze on the market today that is compatible with all leading plastic building blocks, including DUPLO? and Mega Blok?. Never the same toy twice! Block-N-Roll? has hundreds of building options to create plenty of action by dropping, tunneling, ramps, cross-overs, and turns... Attach and detach Block-N-Roll? pieces by sliding them together. Start the construction of your maze from the bottom and work up. Support and raise your Block-N-Roll? pieces with DUPLO? brand blocks, Mega Blok? or the new Taurus Block. Bring out your old construction blocks with Block-N-Roll? to create incredible marble mazes. In addition to producing colorful and exciting maze systems, Block-N-Roll? develops manipulative skills, promotes creativity, and strategic thinking The 100-piece set includes: 12-Straights 16-Ramps 20-(90) Degrees 8-Start/Stops 6-Cross Overs 2-Drop Thrus 30-BNR Dimple Blocks 4-Base Plates 10-Marbles