First, we need to clear up a major point of confusion. When most people search for "Tekken Tag Tournament 4 player," they are looking for a 1v1v1v1 free-for-all. That does not exist in the vanilla game.
Instead, what Tekken Tag Tournament (released for PS2, Arcade, and later PS3/PS4) offers is 2v2 Tag Mode with four human players.
Here is the breakdown of the two distinct 4-player modes:
In a 1v1 fighting game, the camera focuses on the two characters. In 4-player mode, the screen splits into four quadrants (or dynamically zooms, depending on your settings). However, the real chaos begins when two players start fighting on one side of the screen, and the third and fourth players start a separate duel on the opposite side. The camera doesn't know where to look. You will often find yourself fighting off-screen, relying on sound cues and muscle memory.
Why did Namco abandon this brilliant mode? After Tekken Tag Tournament 2 (2012), the series moved strictly to 1v1.
The reason is Online Play. Modern fighting games are built for netcode. A 4-player tag match requires four stable internet connections. If one person lags, the whole match desyncs. Furthermore, modern "Rollback Netcode" struggles with tag mechanics because the state of two characters entering the screen simultaneously is computationally heavy.
Today, the only way to experience the chaos is local play. This has turned Tekken Tag Tournament 4 player into a "party rarity"—a game mode that exists only in basements, retro gaming conventions, and the memories of Millennials who wore out their Multitaps.
No modern fighting game has replicated TTT’s 4-player mode properly.
Tekken Tag Tournament remains unique.