MX-18 in TTK Testing appears to be part of the game’s newer weapon/update cycle, and current community sources point to the game itself rather than a code or external unlock system. The clearest path is to join the official TTK Testing experience, then look for the weapon in the updated gunsmith/loadout or ground spawn system tied to the latest patch.

What the sources show

  • The TTK Testing wiki says the game has a recent “M18 Update & M4 Benelli Shotgun,” which suggests weapon availability is patch-based rather than code-based.
  • The same wiki also says there are no active codes and no redemption system right now, so “MX-18” is not something you’d unlock with a promo code.
  • A recent showcase video is specifically centered on the TTK Testing update and links back to the official Roblox game page, which is the most likely place to get the weapon in-game.

How to try getting it

  1. Open the official TTK Testing game in Roblox.
  1. Check the current weapon menu, gunsmith, or any newly added spawn locations after joining a fresh server.
  1. Look for patch notes or update pages that mention the MX-18, M18, or related weapon unlock changes.
  1. If the weapon is not visible, try a newer server version, since early-access Roblox shooters often roll out content gradually.

Most likely interpretation

If you mean the MX-18 weapon in TTK Testing , the answer is probably that you get it through the latest game update rather than a code, trello, or secret external step. If you mean a different item named MX-18 from a specific video or server rumor, that would need the exact context from that source, because current public references are sparse.

Practical note

The community pages available now emphasize verified sources like the official Roblox game page and the wiki, and they specifically warn against fake codes or fake Trello-style unlock claims.