a={}
for i=1,20 do
 b={}
 b.x=64
 b.y=64
 add(a,b)
end

function _update()
 if (btn(0)) a[1].x-=1 sfx(0)
 if (btn(1)) a[1].x+=1 sfx(0)
 if (btn(2)) a[1].y-=1 sfx(0)
 if (btn(3)) a[1].y+=1 sfx(0)

 for i=2,20 do
 a[i].x=a[i].x*0.8+a[i-1].x*0.2
 a[i].y=a[i].y*0.8+a[i-1].y*0.2
 end
end

function _draw()
 cls()
 for z in all(a) do
 spr(1,z.x,z.y)
 end
end