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Cart #freecell1k-0 | 2021-09-28 | Code ▽ | Embed ▽ | License: CC4-BY-NC-SA
5

Free Cell, in 1022 characters of code, and no sprites! twitter | itch

CONTROLS:

  • click and drag cards around
    • you cannot move stacks of cards; one at a time only!
  • stack descending cards of alternating colors in the main play area
    • any card may be placed in an empty column of the main area
  • store any card in the four "free cells" at the top left
  • make a stack of each suit A->K in the top right to win
  • reset the cart to start a new game

ONE AT A TIME?

You can only move one card at a time; if you want to move a stack of cards you have to take it apart and put it back together manually. This is different from "standard" solitaire, and it makes Free Cell particularly interesting! It also makes the implementation a bit easier to fit into the tiny code-size constraint ;)

I WON!

Congrats! Enjoy the win animation here: https://pancelor.itch.io/solitaire-win-animation (I wanted to add a "you win" animation to this game, but I didn't have the room to fit it in... so I made it as a separate cartridge)

SOURCE CODE

The source is in the cart, of course, but it's here too. Remember to enable puny text mode (cmd-p) before pasting this into your local PICO-8 console:

A=add
W=12w=13Z=16s={}B={}Q=1T=0M=9q=poke2
function F(i)S=s[i]J=i\W I=i\8O=1-I U=I*(i-8+J)*14+O*i*Z+2V=O*max(#S*6+22,28)+5end
for i=0,51do s[i]={m=i\W}A(B,{x=i,y=400,k=i+i\w*3},rnd(i+1)+1)end
q(-15-๐Ÿ˜,264,2043,4,3843)D=rectfill::_::L=T%8T+=1K=B[T]N=not btn(5)X=stat(32)-6Y=stat(33)-8C=fillp
if(T>52)q(14-๐Ÿ˜,3)M=T%3
for i=15,0,-1do
F(i)M|=S.m
C(โ–’)a=5+O*28D(U,a,U+W,a+Z,2)C()for _ENV in all(S)do x=u+3*x+.5>>2y=v+3*y+.5>>2end
G=abs(X-U)\8+abs(Y-V)\Z<<6v=S[#S]k=w
if(v)k=v.k
if(2>>k%Z>M+J*2)K=A(B,del(B,v))L=W+k\Z
if(H and N and(J+G+#S<1or Z-I|k+G==Z|1+H.k^^32or H.k==J+k|G))K=H L=i
if(btnp(5+J+G))H=A(B,del(B,v))end
if(K)del(s[K.h],A(s[L],K))F(L)S.m/=2K.u,K.v,K.h=U,V,L?"โทi6v1d1"
if(H)H.x,H.y=X,Y
if(N)H=nil
for r in all(B)do
x=r.x
y=r.y
q(63-๐Ÿ˜,244)D(x-1,y-1,x+W,y+Z,4)q(61-๐Ÿ˜,-1,-1)D(x,y,x+W,y+Z,3)a=r.k%Z+1?(a==10and"³f|³f0 ³b"or sub("a23456789|jqk",a,a).." ³d")..split("♥,โ—†,โ—†โต8f..³aแถœ3.,โ—†โต8fใƒ‹")[r.k\Z+1],x+1,y+1,r.k\32
for i=0,77do
pset(x+W-i%w,y+Z-i\w,pget(x+i%w,y+i\w))end
end?"โ—โถ1โถc6",X+2,Y+7,5
if(M< Q/โง—)Q=0?"โทceg4"
goto _

(there's an extra space in there near the end because the BBS text editor seems to choke on the < symbol)

An earlier, more readable, and much longer version of this code can be found here

SOME CODE HIGHLIGHTS

Some of the more bizarre tricks I used to squeeze every bit of functionality out of my 1024-character budget:

  • set the palette with poke2(-15-๐Ÿ˜,264,2043,4,3843)
  • update card positions with for _ENV in all(S)do x=u+3*x+.5>>2y=v+3*y+.5>>2end
  • dynamically cast shadows with a very particular palette and poke2(63-๐Ÿ˜,244)rectfill(x-1,y-1,x+W,y+Z,4)poke2(61-๐Ÿ˜,-1,-1)
  • draw the 4 suit icons with split("♥,โ—†,โ—†โต8f..³aแถœ3.,โ—†โต8fใƒ‹")[suit_id]
  • check if you can drop your held card with i\12+G+#S<1or 16-i\8|k+G==16|1+H.k^^32or H.k==i\12+k|G
  • wait until the next frame and clear the screen with ?"โถ1โถc6"

    • (thanks to zep for pointing out that \^ can be written as โถ!)
  • auto-move cards to the top right by tracking the minimum stack height with bitshifting (search for M (and m) to see the relevant code)
  • check whether the game is won by taking advantage of the fact that 2^12<โง— and โง—<2^13

I'M SORRY, "poke2(63-๐Ÿ˜,244)"???

Yeah! 63-๐Ÿ˜ is 24414.5, which is the address I need to poke to get those slick shadows! Check out this post for more info.

P#97939 2021-09-28 22:10 ( Edited 2021-09-30 04:04)

1

I love freecell! And this is absolutely incredible how you did this. Thanks for the code highlights section, so wild!

P#98003 2021-09-29 20:52

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