- A random player gets the first turn.
- The player selects a column with the arrow keys and presses Down to drop his disc.
- The game can be paused, restarted and aborted by pressing Up.
- If a player connects four, these discs blink and the players are asked whether they want to play again.

Note spaces before line ends!

:: :Full :{6,7→dim([J] :getKey :ClrHome :Disp "","","Blijbol","Happy business","","www.blijbol.nl :For(G,1,180 :End :Disp "","Connect4 v1.0"," :For(G,1,70 :End :Output(7,1,"(C) 2007 Jeroen :Output(8,1,"van der Gun :Pause :Lbl G :ClrHome :For(G,3,8 :Output(G,1,"! :Output(G,16,"¡ :End :Fill(0,[J] :0→F :4→X :If rand<.5 :Then :"{}→Str0 :Else :"<>→Str0 :End :Output(1,8,Str0 :Repeat 0 :getKey :While Ans≠34 :If Ans=22 or Ans=25 or Ans=45 or Ans=105 :Menu("Game paused","Continue",C,"Restart",R,"Quit",A :If Ans=24 :Then :If X>1 :Then :Output(1,2X," :X-1→X :Output(1,2X,Str0 :End :Else :If Ans=26 :Then :If X<7 :Then :Output(1,2X," :X+1→X :Output(1,2X,Str0 :End :End :End :Lbl C :getKey :End :If not([J](1,X :Then :Output(1,2X," :Output(2,2X,Str0 :For(G,1,70 :End :Output(2,2X," :Output(3,2X,Str0 :1→Y :If [J](2,X :0 :While Ans :For(G,1,70 :End :Output(Y+2,2X," :Y+1→Y :Output(Y+2,2X,Str0 :If Y=6 :Then :0 :Else :If [J](Y+1,X :0 :End :End :If Str0="<> :Then :1→[J](Y,X :1→C :Else :2→[J](Y,X :2→C :End :For(N,max(1,Y-3),min(3,Y :For(M,max(1,X-3),min(4,X :If C=[J](N,M) and C=[J](N+1,M+1) and C=[J](N+2,M+2) and C=[J](N+3,M+3 :Then :Repeat 0 :Output(N+2,2M," :Output(N+3,2M+2," :Output(N+4,2M+4," :Output(N+5,2M+6," :For(G,1,40 :If getKey>0 :Goto O :End :Output(N+2,2M,Str0 :Output(N+3,2M+2,Str0 :Output(N+4,2M+4,Str0 :Output(N+5,2M+6,Str0 :For(G,1,40 :If getKey>0 :Goto O :End :End :End :If C=[J](N,M+3) and C=[J](N+1,M+2) and C=[J](N+2,M+1) and C=[J](N+3,M :Then :Repeat 0 :Output(N+2,2M+6," :Output(N+3,2M+4," :Output(N+4,2M+2," :Output(N+5,2M," :For(G,1,40 :If getKey>0 :Goto O :End :Output(N+2,2M+6,Str0 :Output(N+3,2M+4,Str0 :Output(N+4,2M+2,Str0 :Output(N+5,2M,Str0 :For(G,1,40 :If getKey>0 :Goto O :End :End :End :End :End :For(N,max(1,Y-3),min(3,Y :If C=[J](N,X) and C=[J](N+1,X) and C=[J](N+2,X) and C=[J](N+3,X :Then :Repeat 0 :Output(N+2,2X," :Output(N+3,2X," :Output(N+4,2X," :Output(N+5,2X," :For(G,1,40 :If getKey>0 :Goto O :End :Output(N+2,2X,Str0 :Output(N+3,2X,Str0 :Output(N+4,2X,Str0 :Output(N+5,2X,Str0 :For(G,1,40 :If getKey>0 :Goto O :End :End :End :End :For(M,max(1,X-3),min(4,X :If C=[J](Y,M) and C=[J](Y,M+1) and C=[J](Y,M+2) and C=[J](Y,M+3 :Then :Repeat 0 :Output(Y+2,2M," :Output(Y+2,2M+2," :Output(Y+2,2M+4," :Output(Y+2,2M+6," :For(G,1,40 :If getKey>0 :Goto O :End :Output(Y+2,2M,Str0 :Output(Y+2,2M+2,Str0 :Output(Y+2,2M+4,Str0 :Output(Y+2,2M+6,Str0 :For(G,1,40 :If getKey>0 :Goto O :End :End :End :End :If F=41 :Then :Repeat 0 :Output(1,4,"Full Grid :For(G,1,40 :If getKey>0 :Goto O :End :Output(1,4," :For(G,1,40 :If getKey>0 :Goto O :End :End :End :F+1→F :If Str0="<> :Then :"{}→Str0 :Else :"<>→Str0 :End :Output(1,2X,Str0 :getKey :End :End :Lbl R :Menu("Restart game?","No",C,"Yes",G :Lbl A :Menu("Quit game?","No",C,"Yes",Q :Lbl O :Menu("Game over","Play again",G,"Exit to OS",Q :Lbl Q :ClrHome

Language: English

System requirements: Texas Instruments graphing calculator running TI-83 Plus or TI-84 Plus operating system (Silver Edition is also fine), 1840 bytes free RAM memory or archive space for storage (during use more RAM memory is needed)

A stable version of this product has been released.
The project was announced at 20 July 2007.

This game has been created by Jeroen van der Gun in TI-Basic.

Games:
Snake, Decoder, Drop, Virus, 1000

Software: Color Contrast Checker, Unix Time Converter, Base Converter, Wrongs, Quadratic formula

Software: Color Contrast Checker, Unix Time Converter, Base Converter, Wrongs, Quadratic formula

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