Metroid Prime Federation Force gameplay live now!

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And here is a link on cel-shading. 

http://raulreyesfinalproject.files.wordpress.com/2012/12/dissertation_cell-shading-raul_reyes_luque.pdf

What you are calling cel-shading is actually monotone cel-shading. It certainly isn't the only type of cel-shading there is. 

Another great example mentioned in the dissertation I linked is Prince of Persia.