1 .\" $OpenBSD: tetris.6,v 1.21 2017/06/19 06:04:16 bentley Exp $
3 .\" Copyright (c) 1992, 1993
4 .\" The Regents of the University of California. All rights reserved.
6 .\" This code is derived from software contributed to Berkeley by
7 .\" Nancy L. Tinkham and Darren F. Provine.
9 .\" Redistribution and use in source and binary forms, with or without
10 .\" modification, are permitted provided that the following conditions
12 .\" 1. Redistributions of source code must retain the above copyright
13 .\" notice, this list of conditions and the following disclaimer.
14 .\" 2. Redistributions in binary form must reproduce the above copyright
15 .\" notice, this list of conditions and the following disclaimer in the
16 .\" documentation and/or other materials provided with the distribution.
17 .\" 3. Neither the name of the University nor the names of its contributors
18 .\" may be used to endorse or promote products derived from this software
19 .\" without specific prior written permission.
21 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 .\" @(#)tetris.6 8.1 (Berkeley) 5/31/93
40 .Nd the game of tetris
49 command runs a display-based game.
50 The object is to fit shapes together to form complete rows,
52 When the shapes fill up to the top, the game ends.
53 You can optionally select a level of play or custom-select control keys.
55 The default level of play is 2.
57 The default control keys are as follows:
59 .Bl -tag -width "<space>" -compact -offset indent
63 rotate 1/4 turn counterclockwise
74 The options are as follows:
75 .Bl -tag -width indent
77 Classic tetris mode, in which shapes rotate clockwise and are drawn with
80 The default control keys can be changed using the
85 argument must have the six keys in order; remember to quote any
86 space or tab characters from the shell.
89 .Dl "tetris -l 2 -k 'jkl pq'"
91 will play the default game, i.e. level 2 with the default
93 The current key settings are displayed at the bottom of the screen
96 Select a level of play.
98 Switch on previewing of the shape that will appear next.
99 This penalizes your score.
101 Display the top scores.
104 At the start of the game, a shape will appear at the top of the screen,
105 falling one square at a time.
106 The speed at which it falls is determined directly by the level:
107 if you select level 2, the blocks will fall twice per second;
108 at level 9, they fall 9 times per second.
109 (As the game goes on, things speed up,
110 no matter what your initial selection.)
113 on the bottom of the field, another will appear at the top.
115 You can move shapes to the left or right, rotate them counterclockwise,
116 or drop them to the bottom by pressing the appropriate keys.
117 As you fit them together, completed horizontal rows vanish,
118 and any blocks above fall down to fill in.
119 When the blocks stack up to the top of the screen, the game is over.
121 You get one point for every block you fit into the stack,
122 and one point for every space a block falls when you hit the drop key.
123 (Dropping the blocks is therefore a good way to increase your score.)
124 Completing a row rewards you with a bonus corresponding to the number
125 of simultaneous rows completed.
126 Your total score is the product of the level of play
129 points on level 3 gives you a score of 600.
130 Each player gets at most one entry on any level,
131 for a total of nine scores in the high scores file.
132 Players who no longer have accounts are limited to one score.
133 Also, scores over 5 years old are expired.
134 The exception to these conditions is that the highest score on a given
138 so that following generations can pay homage to those who have
139 wasted serious amounts of time.
141 The score list is produced at the end of the game.
142 The printout includes each player's overall ranking,
143 name, score, and how many points were scored on what level.
144 Scores which are the highest on a given level
145 are marked with asterisks
148 .Bl -tag -width $HOME/.tetris.scores
150 Name displayed in high score file.
153 .Bl -tag -width $HOME/.tetris.scores
154 .It Pa $HOME/.tetris.scores
159 Adapted from a 1989 International Obfuscated C Code Contest winner by
162 .An Darren F. Provine .
164 Manual adapted from the original entry written by
167 .An Darren F. Provine .
169 Shape previewing code adapted from code by
172 The higher levels are unplayable without a fast terminal connection.