MafiaCoop 0.16.0 (pre-release, not yet tested in game)

Pre-release. Not yet tested in game on two PCs. 0.16.0 fixes the problems found in the 2026-10-18 (one PC) and 2026-10-19 (two PCs) tests and rewrites how the games stay in step: the other players, their cars, enemies, pedestrians, traffic and the time of day. All of it is checked by automated tests only, so expect rough edges and please send the logs after you play.

Download MafiaCoop-0.16.0.zip, extract it anywhere (not into the game folder) and run MafiaCoop.exe. The zip's README.txt covers requirements, hosting and joining, settings, the optional start-from-Steam mode and uninstalling. MafiaCoop-0.16.0-symbols.zip holds the PDBs and is only needed to read crash dumps. Both players need 0.16.0: it can't play with 0.15.0. A player on another version is turned away with a "version mismatch ... Both players need the same MafiaCoop version" message.

Requirements

• Windows 10/11, 64-bit
• Mafia: Definitive Edition that you own on Steam, Steam build 16502642 (the current one); Steam running
• Everyone in a session on 0.16.0; joining by IP needs UDP port 27960 open on the host

Worked in the 2026-10-19 two-PC test (with 0.15.0)

Steam invites and joining over Steam, the lobby, movement, riding along in a friend's car, the host's traffic on a friend's game, car damage, the host's police chasing a wanted friend, Free Ride death and respawn, punches landing, a real gamepad in the co-op panels and leaving cleanly. 0.16.0 changes several of these, so they need checking again.

New in 0.16.0, not yet tested in game

• Smoother players: the other players walk, run and stop like they really do, closer to where they are, without sliding back.
• Cars: a friend's car drives at its real speed (it ran at about a quarter), drives on its own physics instead of being pinned, and looks like his car (variant, colours, plate). One wheel, one driver. Cars parked before you joined are there.
• Shooting each other works (bullets never hurt a player in the test). Punches lock on to a player in front of you.
• Enemies and police: each enemy is run by one game only, so the host's cops chasing a friend are in the same place on both screens.
• Pedestrians are shared, and a pedestrian you kill dies on every game.
• Traffic is shared wherever players are, also between two friends far from the host, without cars popping.
• Time of day follows the host without jumps.
• Fixes from the tests: punches and throws on the other player's character, the minimap marker, damage after an explosion, seats after a reload, a wanted friend's police level running down, the garage file no longer changed by co-op, motorbikes, swimming, a paused game, traffic losing its drivers, changing character.

Known issues

• Not tested yet: all of 0.16.0. Please zip the whole logs folder on both PCs after playing and send both.
• A player sitting in a car can't be shot by the other players, not even through an open window.
• After a player gets off a motorbike, its copy may stay on the other screens for up to a second.
• Car damage and car colours aren't shared for traffic that a friend's game spawned.
• Not reached in any test yet: JOIN FRIEND between two PCs, chapters on two PCs, reconnecting over Steam, doors, picking up items, grenades, three or four players.

Full details: CHANGELOG.md. Core: v0.12.0 (changes).