Hacker

Other computer games often have lengthy instructions to explain how
the game is played.

Hacker(tm) is not like other computer games.

We’ve told you how to load the program: the rest is up to you. A
real-life hacker would proceed by trial and error: and that’s how you
play this game. The only tip we give you is, don’t play Hacker(tm)
like a standard adventure. You’ll get further, faster, if you just try
things out, instead of trying to decide what the next most logical
step would be.

So start hacking!

(c) Activision, 1985.
(Typed by Chubby Brown/Profanity ’94)

Source: TheGamesDB