The flashlight in The Mimic on Roblox is commonly activated with the R key. A player comment in a public group specifically says they use R to keep the flashlight on, and related guides discuss flashlight/lantern controls in the game.

Quick answer

  • PC: Try R first.
  • If that does not work, the game may be using a different item or control scheme in your chapter or device version.

Small note

Some pages about The Mimic also mention lantern controls rather than a flashlight, so the exact button can vary by item or platform.