Free Kids’ Computer Learning Game Called Woogi World

My son and daughter love this game and best of all the sign-up is free.  
Here is the link for Woogiworld.com: 
Woogi
WoogiWorld is a virtual world (pretend world) where  kids choose a little character who competes with other Woogis in their Woogi World.  Kids can build and decorate a house (woogiwam)  for their little Woogi.  Kids earn coins and buy stuff [...]