The code for Horde Rush in Fortnite depends on the specific map that you want to play. Here are some codes for different Horde Rush maps:

• Horde Rush REMASTERED by raz0r: Map code 8301-4543-0935
• Horde Rush by SHUCKSOURDIESEL: Map code 1811-5278-9963
• Storm City Horde Rush! by LlamabuildsFN: Map code 0797-6640-5147

Its important to note that some players have reported issues finding the correct version of Horde Rush due to Epic Games adding the incorrect version of the game mode.