Horde of Enemies is a mission in the game. It is a race against Knuckles the Echidna, played as Classic Sonic.
A horde of giant enemies will interfere your race with Knuckles.
Knuckles will use his dig ability in this mission, so be quick. Also, gigantic and regular enemies will appear throughout.
To get an S rank, you need to finish the stage in 1:20.