There are 2 series of Yu-gi-oh; the original one, 
and then King of Games (the one shown in America).

The original anime didn't last very long (I 
belive it got pulled at some point) and IS cel 
based (I have some cels in my gallery like the 
one pictured below ^__^).

The King of Games anime that most people know is 
CG based - so sketches only!

Hope this helps ^___^