Sonic Robo Christmas Blast

SRB1 Christmas (also known as Sonic Xmas Blast) was released in December 1998, during the period between the end of SRB2 TGF's development and the release of SRB2 Halloween a year later, as it was clear by then SRB2 would no longer be using this engine. It is largely a repackaging of SRB2 TGF's existing levels with Christmas-themed names and a winter theme applied. The ability to save the game was not present however, and the game itself would start immediately on load.

Months after Dr. Eggman's defeat in Sonic Robo Blast, the mad doctor took an interest in harnessing energy from a mysterious asteroid that hovers over the planet once every five years. After claiming it as his own battleship, Eggman chose Greenflower Mountain as his first target for obliteration. Sonic was enjoying a long overdue vacation when he was suddenly alerted by the presence of Eggman's massive fleet. Sonic gazed at the giant battleship aimed toward the mountain , and had already bolted towards it in a blink of an eye. Even though Sonic rushed to save Greenflower Mountain as quickly as possible, it had already been destroyed in by the time he arrived. Now, after a quick reunion with the evil doctor, Sonic and friends journey off onto another quest to save the world from Dr. Eggman.