Sponsor Games are games that only released once in a while and often it will not stay long in neopets.
Sponsor games are for companies to advertise in neopets, to get more people to know their products and buy them.

Quote:

Earn Neopoints and support the Neopets website at the same time by playing our sponsors' games! Additionally, learn about upcoming movies, DVDs and other products while adding some NP to your bank account!

Click here to visit the sponsor games!

Current Sponsor Games are :
* Dance, Goldfish, Dance!
* Xtreme Sock Mountain Climbing
* Free Fall
* The Dandelion Wish Game
* Froot Loops: Black Beak's Code
* Underwater Race to the Bowl
* Seek Your Personality
* Kit Kittredge - Road to the Newsroom
* Six Flags - Water Patrol
* Six Flags - Coaster Car Race
* Camp Dino's Capture the Flag
* Cafeteria Caper
* NC Shopping Spree
* Adver-video

thanks kirra for the link