By Spencer . July 24, 2007 . 4:30pm
Many years after it has become a treasured memory people are still developing games for the Nintendo Entertainment System. Occasionally, homebrew games come out in gray cartridge shells, but Sudoku for the NES also has a rare gold cartridge edition. Only five of these were made and one of them will be auctioned off at the Classic Gaming Expo, which takes place at this weekend at Las Vegas. Standard gray cartridges will also be on sale, but bland gray carts don’t celebrate the epic level of 8-bit Sudoku like a gold cartridge.