SpongeBob SquarePants: Underpants Slam (found Xbox Live Arcade game; 2007)
Status: Inaccessible
Spongebob Squarepants: Underpants Slam is a 2007 Xbox Live Arcade game released alongside Screwjumper!
It is an action-puzzle game that includes the characters from the Spongebob Squarepants animated show.
Due to a lack of interest, the game's servers are still up but are often empty, and the game is no longer available for sale on the Xbox Live Marketplace.
"Lost" status
This game can be determined not so much as "lost" as it is "inaccessible," because many users have it downloaded on their hard-drives, but it's not currently available to those who don't have it and want it.
As such, this game falls into a special in-between group of lost media, since it isn't quite lost.
Found Game
After sifting through some XBLA torrents, the game has been found and here is a link to download the game: Download Spongebob Squarepants: Underpants Slam!
You will need a modified/Jtagged Xbox 360 console to play the game, and it is confirmed working on one.
Gallery
Gameplay screenshot
Another gameplay screenshot
