The level editor for Hotline Miami 2: Wrong Number was a feature held back when the game launched in March, promised to be coming some months after launch. Dennaton officially revealed on their blog today that a public beta of the level editor will be available for PC users on December 10, 2015.
Only Steam users on Windows platforms will have access to the beta, but when the level editor launches it will be available on Mac and Linux as well. The PlayStation 4, Vita and PS3 versions of the game will have no level editor. The beta is planned to remain open until early January, with the full version coming very soon after. There is no guarantee that levels made in the beta will carry over after the update.
Hotline Miami 2: Wrong Number is available now on PC, Mac, Linux, PS4, PS3 and PS Vita.