Slide turns your TV screen into one of those pocket puzzles where you have to push pieces around in order to reform a picture or sequence of letters or numbers. In each of the three puzzles there is naturally one blank space to help you in this, otherwise the game would be a complete non-starter. Mind you, it's not much of a starter as it is. You use the arrow keys to move the blank piece round the board - a quite logical arrangement whereby the down arrow moves it up and the left arrow moves it right. And so on.
Each puzzle is a six by seven grid, graded for difficulty, the easiest being a straight-forward sequence of numbers, next easiest hexadecimal numbers from one to 29, and hardest is a map of the good old USA. Pressing 'H' at any time will show you the correct solution, and this stays on the screen for as long as you care to keep it there.
I find this type of puzzle exceedingly tedious, and because of this quickly noticed one glaring fault, which is that you can't quit a game to choose another option. You have to reload or risk your luck with the reset button. Even if you like this type of game, it would seem easier to me to try the real pocket variety: much neater than Dragon, tape deck and VDU, which I find tend to make my pockets bulge somewhat.