I have a question

there is a way to check if pixel is turn on or off? because I don't find another way to make walls and obstacles in the game, and in that way I will know if the player standing on pixel... thank you!

Welcome! There are many ways to know if a player tries to stand on a wall/obstacle (this is called "collision detection"!) If your walls and obstacles are sprites, functions like SPCOL and SPHITSP should do the trick :) Otherwise, I think you would have to write your own code for collision detection. Thankfully, you're not the first person to ask about this. I found a thread here that gives a code example for collision with BG tiles: https://old.smilebasicsource.com/forum?fpid=10102#post_10102 I also found this video about sprite collision, made by the SmileBASIC developers: https://www.youtube.com/watch?v=scr1gsOG3q4 Collision detection can be a bit tricky for beginners, so if you still have troubles, let us know!