Map making is a key part of making many types of games.
Most maps are created use pre-drawn images on the graph screen, while a select few make use of the home screen. The graph screen is more versatile with its larger size and compatibility. pxl-test( is often used to keep a character on or within the boundaries of a map.
pxl-Test( is what the whole programs runs off.
The command pxl-Test( returns either 1 or 0, indicating whether a pixel is activated or not. Using this, you can use a movement loop where the character will not move onto a designated area. For example:
This would check to see if there is a pixel at 5,2; if so then a 1 will be returned, if not, a 0 is returned.
Type in this code into your calculator:
ClrDraw RecallPic 1 55→X 60→Y Repeat A=45 Pxl-On(Y,X Repeat Ans getKey→A End Pxl-Off(Y,X X-(Ans=24 and not(pxlTest(Y,X-1)))+(Ans=26 and not(pxl-Test(Y,X+1→X Y-(A=25 and not(pxlTest(Y-1,X)))+(A=34 and not(pxl-Test(Y+1,X→Y End
Make any random map that pleases you and press [2ND] + [DRAW] + [LEFT] + [ENTER] +  + [ENTER] (Storepic 1). This will override Pic1 with whatever map you created. The movement loop will need to be customized for your map though. A simple maze game is easier to make then a platformer that requires jumping, shooting, moving, etc.
Things to make sure of
1) Make sure that the pixel at (55,2) is not activated (black)
2) Make sure that your window settings are as follows: Xmin=0, Xmax=94, Ymin=0, Ymax=62. This makes sure that the resolution on the screen fits the Pt-On( command (this makes life easier)
3) Remember that Pxl-On( follows the syntax of Output where it is Pxl-On(Row, Column).