Question 1

Is SRB2Kart free?

Accepted Answer

Yes. It is free and open-source under GPL-2.0. The official builds are on GitHub (STJr/Kart-Public).

Question 2

How does online multiplayer work?

Accepted Answer

Same family as SRB2: host a network game on UDP 5029. PlayBound Connect puts the party on one virtual LAN and Join Game can pass +connect host:port.

Question 3

Does it support controllers?

Accepted Answer

Yes. v1.6 uses the SDL Game Controller API for a wide range of pads. PlayBound does not rewrite a config file.

Question 4

Is it an official Sega game?

Accepted Answer

No. It is a free fan game from the Sonic Team Junior / Kart community, like SRB2.