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.\" $OpenBSD: snake.6,v 1.11 2009/11/13 21:50:12 deraadt Exp $
.\" $NetBSD: snake.6,v 1.5 1995/04/22 08:34:35 cgd Exp $
.\"
.\" Copyright (c) 1980, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)snake.6 8.1 (Berkeley) 5/31/93
.\"
.Dd $Mdocdate: November 13 2009 $
.Dt SNAKE 6
.Os
.Sh NAME
.Nm snake
.Nd display chase game
.Sh SYNOPSIS
.Nm snake
.Op Fl st
.Op Fl l Ar length
.Op Fl w Ar width
.Sh DESCRIPTION
.Nm snake
is a display-based game.
The object of the game is to make as much money as possible without
getting eaten by the snake.
The
.Fl l
and
.Fl w
options allow you to specify the length and width of the field.
By default the entire screen (except for the last column) is used.
The
.Fl s
option shows all scores.
The
.Fl t
option makes the game assume you are on a slow terminal.
.Pp
You are represented on the screen by an I.
The snake is 6 squares long and is represented by s's with an S at the head.
The money is $, and an exit is #.
Your score is posted in the upper left hand corner.
.Pp
You can move around using the same conventions as
.Xr vi 1 :
that is, the
.Ic h ,
.Ic j ,
.Ic k ,
and
.Ic l
keys work, as do the arrow keys.
Other possibilities include:
.Bl -tag -width indent
.It Ic sefc
These keys are like hjkl but form a directed pad around the d key.
.It Ic HJKL
These keys move you all the way in the indicated direction to the
same row or column as the money.
This does
.Em not
let you jump away from the snake, but rather saves you from having
to type a key repeatedly.
The snake still gets all his turns.
.It Ic SEFC
Likewise for the upper case versions on the left.
.It Ic ATPB
These keys move you to the four edges of the screen.
Their position on the keyboard is mnemonic, e.g.\&
P is at the far right of the keyboard.
.It Ic x
This lets you quit the game at any time.
.It Ic p
Sometimes points in a direction you might want to go.
.It Ic w
Space warp to get out of tight squeezes, at a price.
.El
.Pp
To earn money, move to the same square the money is on.
A new $ will appear when you earn the current one.
As you get richer, the snake gets hungrier.
To leave the game, move to the exit (#).
.Pp
A record is kept of the personal best score of each player.
Scores are only counted if you leave at the exit.
Getting eaten by the snake is worth nothing.
.Pp
As in pinball, matching the last digit of your score to the number
which appears after the game is worth a bonus.
.Pp
To see who wastes time playing snake, run
.Nm snake
.Fl s .
.Sh FILES
.Bl -tag -width /var/games/snakerawscores -compact
.It Pa /var/games/snakerawscores
database of personal bests
.\".It Pa /var/games/snake.log
.\"log of games played
.El
.Sh BUGS
When playing on a small screen,
it's hard to tell when you hit the edge of the screen.
.Pp
The scoring function takes into account the size of the screen.
A perfect function to do this equitably has not been devised.
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