In 2016, it was discovered that the first two levels of TimeSplitters 2 (Siberia and Chicago) could be found within Homefront: The Revolution. They are accessible using an arcade cabinet in the game's Restricted Zone. The levels were ported to the game in native 4K; there are no texture/model differences, but some elements of the GUI, particle effects, lighting, and weapons sounds are new.

In 2021, programmer Matt Phillips revealed on Twitter that it was not just those two levels, but that the entire game was ported in native 4K and hidden in the same arcade machine in Homefront: The Revolution as an unlockable Easter egg. Despite Phillips stating he lost the code to unlock the full port, Microsoft employee Spencer Perreault replied to Phillips with the correct code a few days later, and with its recovery several other codes to access much of the game's modes and content were discovered by fans. While it is currently unknown how to access TimeSplitters 2's co-op mode, Phillips suggested that if someone could hack two or more arcade machines into a co-op map in Homefront: The Revolution, the game should boot to TimeSplitters 2's multiplayer menu.