1 .\" $NetBSD: tetris.6,v 1.18 2023/07/01 10:51:35 nia 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.
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33 .\" @(#)tetris.6 8.1 (Berkeley) 5/31/93
40 .Nd the game of tetris
49 command is a display-based game.
50 The object is to fit the shapes together forming 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 "xxspacexx" -compact -offset indent
63 rotate 1/4 turn counterclockwise
76 The options are as follows:
77 .Bl -tag -width indent
79 By default, shapes are displayed colorfully if the user's CRT supports color.
82 option can be used to restore the traditional black-and-white behavior.
84 By default, the fallrate is staying constant.
85 With this option, the fallrate increases over time.
87 The default control keys can be changed using the
92 argument must have the seven keys in order, and, remember to quote any
93 space or tab characters from the shell.
96 .Dl "tetris -l 2 -k 'jkl pqn'"
98 will play the default games, i.e. level 2 and with the default
100 The current key settings are displayed at the bottom of the screen
103 Select a level of play.
105 Display the top scores.
107 Switch on previewing of the shape that will appear next.
110 At the start of the game, a shape will appear at the top of the screen,
111 falling one square at a time.
112 The speed at which it falls is determined directly by the level:
113 if you select level 2, the blocks will fall twice per second;
114 at level 9, they fall 9 times per second.
115 (As the game goes on, things speed up,
116 no matter what your initial selection.)
119 on the bottom of the field, another will appear at the top.
121 You can move shapes to the left or right, rotate them counterclockwise,
122 or drop them to the bottom by pressing the appropriate keys.
123 As you fit them together, completed horizontal rows vanish,
124 and any blocks above fall down to fill in.
125 When the blocks stack up to the top of the screen, the game is over.
127 You get one point for every block you fit into the stack,
128 and one point for every space a block falls when you hit the drop key.
129 (Dropping the blocks is therefore a good way to increase your score.)
130 Your total score is the product of the level of play
134 points on level 3 gives you a score of 600.
135 Each player gets at most one entry on any level,
136 for a total of nine scores in the high scores file.
137 Players who no longer have accounts are limited to one score.
138 Also, scores over 5 years old are expired.
139 The exception to these conditions is that the highest score on a given
143 so that following generations can pay homage to those who have
144 wasted serious amounts of time.
146 The score list is produced at the end of the game.
147 The printout includes each player's overall ranking,
148 name, score, and how many points were scored on what level.
149 Scores which are the highest on a given level
150 are marked with asterisks
154 honors the informal standard
156 When it is set in the environment, no color will be used.
158 .Bl -tag -width /var/games/tetris.scoresxx
159 .It /var/games/tetris.scores
164 Adapted from a 1989 International Obfuscated C Code Contest winner by
167 .An Darren F. Provine .
169 Manual adapted from the original entry written by
172 .An Darren F. Provine .
174 Code for previewing next shape added by
178 The higher levels are unplayable without a fast terminal connection.
