Publisher: Tang's Electronic Co.

Tang’s Electronic Co. was a small third-party company that sold Atari 2600 cartridges under its brand Sancho, with 1983 copyright dates on its labels. Its games are hard to find today, and Words-Attack only resurfaced in 2002; collectors rank it as the rarest of all Sancho cartridges. It plays like a simple invaders game in which most targets are letters.
The other documented game here is Nightmare (1983), a single-screen climbing game in which a sleeping child climbs magic ropes towards a rescue helicopter, past birds, floating faces, balloons and a snake. The page also lists Skindiver and Forest.
Choose one below and play it in your browser.