Here is a list of controls for Titus' Titan.

Q - left
W - right
P - up
L - down

You can also use the cursor keys or the joystick to move the racket. Use SPACE
or the Fire button to slow down the scrolling.

Other controls are:

ESC - restart level (unless you have altered this function using the cheat)
SHIFT+ESC - quit game and save high score to disc
CTRL+ESC - quit game without saving high score to disc
CTRL+SHIFT+ESC - reset computer

You can only save your high score to disc if you are playing the disc version of
the game (the cassette version of the game is also included on the disc). The
high scores are saved as TITAN.N26. Do not delete this file!

Note also that the cassette version of Titan only has 16 levels, whereas the
disc version has 80 levels.