This is a sub-page of Sonic Frontiers.
Sonic Frontiers was built using Sonic Forces as a base, so some code and assets linger in the game's files.
Textures#
Present in raw/ui/rpl_texture.
Splash Screens#

Rating and copyright splash screens. These appear to come from a demo version: the ESRB screens are also unused in Forces (although the "Rating Pending" screen now has red text reading "Temporary image" on it) and the "Thank you for playing" screen appears at the end of the downloadable demo released on storefronts.
Title Screen#


The backgrounds used for the Forces title screen.
UI Elements#

Leftover UI elements from the world map and ranking screens. Sonic and the Avatar's headshots are missing, though Shadow, Classic Sonic, and both versions of Super Sonic are present
Other Leftovers#
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Lighting#
Sonic Frontiers still has support for the baked lighting system that was used from Sonic Unleashed to Forces, but it mostly goes unused in favor for dynamic real-time lighting. The indoor areas of the islands, as well as the Master Trial arena, are the only areas to utilize baked lighting.
Tag Team Remnants#
Sonic Forces features several "Tag Team" levels in which the player controls Sonic and the Avatar simultaneously. The code for controlling multiple characters at once is still present in Frontiers; however, it's broken and desyncs a lot.