The mech game that most likely got really popular was Mecha Break. It showed up in a lot of gaming coverage in mid-2025 as a free, multiplayer mech shooter that drew a big launch buzz.

Why this is the likely one

  • It was repeatedly described as “popular” or “incredibly popular” around its Steam release.
  • Multiple previews and reviews focused on it as the standout mech game of the moment.
  • It also got attention for a big player drop-off after the initial spike, which is a common sign of a game that blew up fast.

Other possible matches

  • Armored Core 6 : a major mech game, but it was more of a strong hit than a sudden viral breakout.
  • Mech Armada and Override: Mech City Brawl were discussed, but they were not the same level of mainstream popularity.

If you meant the mech game that was trending on forums specifically, Mecha Break is still the best fit.