Marvel Tokon: Fighting Souls, a 4v4 tag-team fighter from Arc System Works, launched on August 6, 2026 — and PC players immediately ran into performance problems that the developer's day-one patch did not fully resolve.

Players on PC report dropped frame rates and stuttering regardless of how powerful their hardware is, according to GameSpot. The game also will not launch on Steam Deck, Steam OS, or Linux — a notable gap given that the anti-cheat software it uses, Easy Anti-Cheat (EAC), is widely supported on those platforms.

Arc System Works had flagged the PC issues before launch. On July 28, the official MARVEL Tokon account on X posted a thread acknowledging frame-rate drops, lag, unnecessary shader compilation at startup, and streaming compatibility problems with OBS and Discord, pledging day-one fixes for all of them. The studio also promised improvements to reduce overall CPU usage and to address rollback netcode — the behind-the-scenes technology that smooths online matches — and cross-play issues. But the August 6 GameSpot report indicates players are still experiencing the performance problems post-patch.

The day-one patch notes themselves are extensive. They include removing unnecessary character animation updates to cut CPU load, improving UI performance, and fixing conflicts with overlay and video-capture applications like OBS Studio Game Capture and Discord. The patch also adds an anti-aliasing option — a setting that smooths jagged edges on screen — to the automatic graphics quality preset, corrects unintended anti-aliasing plugins (Nvidia's DLSS, AMD's FSR, and Intel's XeSS, all upscaling technologies that render games at lower resolutions and then sharpen the output), and adds a setting to change how often background characters in stages update.

The game itself is a collaboration between Arc System Works, PlayStation Studios, and Marvel Games. It pits four-player teams of Marvel characters against each other in tag-team bouts, and it ran an open beta before launch that the official X account publicly thanked participants for playing.

Beyond the launch-day fixes, Arc System Works has also laid out a roadmap for downloadable content. The first new fighter arriving this fall is Phoenix Cyclops, a version of the X-Men character drawn from the 2012 Avengers vs. X-Men comic crossover storyline.

For PC players — particularly those who picked up the game on Steam Deck expecting portability — the lingering performance issues and the inability to boot the game at all on Linux-based systems are the more immediate concern. The patch landed, but for a portion of the player base, the fixes promised on July 28 have not yet matched the experience on August 6.