I just finish the game by doing Reefer Madness, and get all Achievement. Now resting before going playing Mortal Kombat, the Challenge Tower is more hard than imagine, cause I'm in 251 as Shang Tsung fighting 3 fighter in one life to Baraka (easy), Sindel (a bit hard) and Shao Kahn (more hard like hell). I'll be stuck or finish him later.