Sonic Robo Blast 2 Windows, Mac, Linux game

-- Old-school Genesis-era platforming - 3rd or 1st person - complete with rings, springs, baddies, reversible gravity and more!
-- Insanely fast-paced multiplayer combat with support of up to 32 players online, as well as 2 player splitscreen.
-- 3 playable characters with unique abilities: Sonic (Speed), Tails (Flight) and Knuckles (Glide/Climb), all balanced for online match play.
-- 8 multiplayer game modes: Cooperative, Match, Team Match, Capture the Flag, Race, Classic Race, Tag and Hide and Seek.
-- Over 30 levels spanning a variety of locations, from green meadows to deep underwater ruins, mines, mountains and space stations - not counting an extensive list of unlocks!
-- 7 unique weapons for use in Match / CTF play: Red Ring (Starting Weapon), Automatic Ring, Bounce Ring, Scatter Ring, Grenade Ring, Explosion Ring and Rail Ring round out a complete FPS arsenal.
-- Original soundtrack, produced by some of the most renowned Sonic music artists on the internet.
-- Loads of unlockables to keep you busy far past completing the single-player campaign, including hidden levels, game modes and cheats!
-- Extensive configuration, allowing play with a modern WSAD + Mouse FPS control setup, a relaxed gamepad setup, arrow keys only setup, or anything in-between. All keys, sensitivities, etc. are individually configurable.
-- Tons of user-created content - custom characters, levels, mods and all sorts of other crap to expand gameplay well beyond the initial package.
-- Well-supported level design tools (such as SRB2 Doom Builder) that allow easy creation of your own custom content. Please see the Level Design section of the SRB2 Wiki for more information.
-- Easy mod creation using the Sonic Object Configuation (SOC) system, where you can script new items, enemies, bosses, scenery effects, etc. using included tools.
-- Full source code for the game, included right with the install, for complete mod creation.