title 10 PRINT
author mino
text_color white
sprite_size 8
run_rules_on_level_start
realtime_interval 0.05

========
OBJECTS
========

Background
black

DiaL
white
00......
000.....
.000....
..000...
...000..
....000.
.....000
......00

DiaR
white
......00
.....000
....000.
...000..
..000...
.000....
000.....
00......

player
white
0......0
........
........
........
........
........
........
0......0

next
transparent

topline
transparent

bottomline
transparent

turn
transparent

moved
transparent

lineStart
transparent
=======
LEGEND
=======

. = Background
dia = diaL or diaR
p = player

t = topline
b = bottomline and lineStart
n = next and bottomline

=======
SOUNDS
=======

================
COLLISIONLAYERS
================

Background
Dia
player
next
topline, bottomline
turn, moved
lineStart


======
RULES
======
( startup preparation )
right [ topline    | no topline    ] -> [ topline    | topline    ]
right [ bottomline | no bottomline ] -> [ bottomline | bottomline ]

( turns )
random [  ] -> [ turn ] (one turn per tick)
[ turn ] [ lineStart no dia ] -> [  ] [ lineStart random dia ]
right [turn][ bottomline dia | no dia ]               -> [  ][ bottomline dia | random dia]

(move all 1 line up)
[ moved ] -> [  ]
[ next dia ] [ topline dia ] -> [ next dia ] [ topline  ]
startloop
up [ next dia ] [ diaL no moved no next | no dia ] -> [ next dia ] [  | diaL moved ]
up [ next dia ] [ diaR no moved no next | no dia ] -> [ next dia ] [  | diaR moved ]
endloop
up [ next dia | ] -> [ next | dia ]

( 'player' agency )
[ action Player diaL ] -> [ Player diaR ]
[ action Player diaR ] -> [ Player diaL ]


==============
WINCONDITIONS
==============

no Player

=======
LEVELS
=======

message 10 PRINT CHR$(205.5+RND(1));       : GOTO 10                       　​

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b......................................n