play the growing worm game
worm, you are a little worm: your body
is the "o"'s on the screen and your head is the "@". You
move with the hjkl keys (as in the game
snake(6)). If you don't press any keys, you continue in the direction
you last moved. The upper case HJKL keys move you as if you had pressed
several of the corresponding lower case key (9 for HL and 5 for JK, or until
you run into a digit, whichever comes first).
On the screen you will see a digit. If your worm eats the digit it will grow longer by that number of "o"'s, scaled to screen size. The object of the game is to see how long you can make the worm grow.
The game ends when the worm runs into either the sides of the screen or itself. The current score (how much the worm has grown) is kept in the upper right corner of the screen.
The optional argument, size, is the initial length of the worm's body. The specified length will be rejected if it causes the worm to cover more than roughly one third of the screen.