C. elegans is a small (~ 1mm long), free-living nematode that is extensively used as a model organism for biological research, including genomics, cell biology, and neuroscience. In this video, we show how C. elegans adapts its motility gaits to move on or through different fluidic environments. This video shows the nematode swimming & crawling behavior in a variety of environments including water, granular materials, and microfluidic systems using high-speed imaging microscopy. Fundamental understanding of the remarkable adaptability of such nematode to different environments can be potentially useful in fields such as medicine, robotics, and biophysics.