Drive a real Crazy Taxi cab through Level 0, ferry hazmat survivors to their stops, and outrun Smilers and Hounds.

How to join The host picks "Start New Game", a map and 2 or more players, leaves "Local Server" unticked, ticks "Peer-To-Peer" and picks "Start Game"; friends right-click the host in their Steam friends list and join. Everyone playing needs this mashup from Melty.
Drive a real Crazy Taxi cab through Escape the Backrooms' Level 0.
Pick up lost wanderers and hazmat-suit survivors, get them to their drop-off before the timer runs out, and stay ahead of the Smilers, Hounds and Bacteria hunting you through the yellow halls.
Nothing from Crazy Taxi or Escape the Backrooms is included in the download. On your first Play (about a minute, once) the mashup reads your own Steam copies and converts the cab, music, voices, characters and Level 0 materials for Garry's Mod. Without either game installed, Garry's Mod still starts and tells you what is missing.
Garry's Mod, Escape the Backrooms and Crazy Taxi (all on Steam).
A remix of Backrooms Sandbox by Matthew Chapman (MIT). Built with AI assistance (Claude). See the credits file for the bundled tools (CUE4Parse, MeshDecimator, VGAudio, OggVorbisEncoder).