https://git.spwbk.site/swatson/pico8/raw/master/box_grow.p8
___________________________________
pico-8 cartridge // http://www.pico-8.com
version 18
__lua__

cell = {
 center = 64,
 startx = 64,
 endx = 64,
 starty = 64,
 endy = 64,
}

function draw_loop(startx,endx,starty,endy)
 for dx=startx,endx do
   for dy=starty,endy do
     pset(dx,dy,1+rnd(15))
   end
 end
end

function derive_bounds(i)
 cell.startx -= i
 cell.starty -= i
 cell.endx += i
 cell.endy += i
end

function _init()
 cls()
end

function _update60()
 cls()
end

function _draw()
 draw_loop(cell.startx,cell.endx,cell.starty,cell.endy)
 r = rnd(20)
 if ( r > 19 ) then
   derive_bounds(1)
 end
end


__gfx__
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00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00077000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00077000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

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