Turbo Sliders Unlimited

Turbo Sliders Unlimited is a spiritual successor to many classic top-down racing games, but in 3D and with modern online features and extensive customization and modding possibilities. It goes far beyond being just a racing game — it is a community-driven platform where anyone can create their own levels, vehicles, and game modes. It can be played as a serious esports game, as a fun casual game, or as a sandbox game. It can be played alone or as a multiplayer game, both locally and online.
The game has a massive number of game modes and tuning possibilities, with new ones still possibly coming. Different game modes include various forms of racing, sumo, tag, soccer, capture-the-flag, collector, and weapon battle. Join the TSU Discord Server to stay up to date with the latest news, share your ideas and feedback, and connect with the developers and other players!
Main features:
Online multiplayer

Supports up to 20 players, plus spectators
Anyone can host their own public or private games with custom levels, vehicles and settings
All game modes supported online: racing, sumo, collector, tag, soccer, CtF, battle and their countless variations
Dedicated server support with server-side scripting
Based on authoritative server and client side prediction — perfect for esports!

Single-player game modes

Time Trials campaign: Race against clock or leaderboard ghosts to unlock new events
Race Challenges campaign: Race against AI players in special race events
Player made campaigns: Play campaigns made by other players, or create and share your own
Quick Game: Compete in multi-event racing sessions against AI players
Local custom game: Customize a game session to your liking — adjust levels, vehicles, event settings, AI etc.
Hotlapping: Beat leaderboard lap times, optionally racing against ghost recordings of other players

Local multiplayer

Couch gaming with up to 4 local players in split-screen
Possible to join or host online multiplayer games together, too

Level and vehicle creation and sharing

Feature-rich in-game level and vehicle editors included
Sharing via Steam Workshop or by automatic downloading in online games

AI Editor

Create and optionally share your own AI lines to new tracks and or vehicles
Create and customize your own AI player groups

Camera

Multiple camera presets, all of which can be extensively tuned
Camera modes include 3rd person (close or far), 1st person, top-down, fixed position, free camera

Recording games

Any game can be recorded and viewed later, with options to change camera angles and playback speeds

Customization

Vehicle looks can be customized by changing color, paint jobs and paint properties (metallicness, smoothness)
It is possible to buy customization packs unlocking new colors, paint textures, more paint commands per a paint job, and more range for paint properties

Special game modes
In addition to standard racing and its variations, the game also supports various other game modes, including:

Parkour platforming obstacle course
Ghost race
Car sumo
Capture the Flag
Base infiltration
Battle with weapons (team vs team or free-for-all)
Tag game (spread or transfer tag)
Car soccer with 1 or up to 5 balls
Car "soccer" without balls (score by driving to goal)
Collector (shared or exclusive coins to collect)
Race with deadly terrain or contacts
Race with drafting on (tunable strength)
Race with weapons enabled
Race with fuel (refueling possible in the pit)
Race with tire wear (changing tires possible in the pit)
Team games - all game modes have team game support
More might be coming - suggest your own ideas on the TSU Discord Server