NumBlox is a cuisenaire rods game. Cuisenaire rods (number blocks) are used in early childhood math, and just for fun. New features! 5-1 ruled graph paper, pencil, eraser, and scrollable window! NumBlox has a simple, clean interface, with rotateable drag and drop blocks on a grid, and a play area that grows to fit your web browser area. Brought to you by the developer of Pattern Blocks, MathToybox.