Alien Snipers

Alien Snipers is a reaction/typing game published in a book "Computer Spacegames".

After selecting the difficulty, your computer will print a letter and a number. You must think through the alphabet by that number of letters and type in the letter you get to. E.g. for M 4, you must type Q, and for C 2, you must type E and so on. Typing in a letter automatically triggers off your laser gun, so if your letter is correct you'll score a hit. You get 10 alien snipers each game.