I figure out the reason why it didn’t work was because I did maze_generation(level, level) but I made level = 1 and I forgot it only increase by +1 in next_level so I just put 4 + level instead so now its a functional maze. In this session I also realise it was very annoying having to spam the letter w or the up arrow to go up so I decide to change it so users could hold it. Instead of turtle.onkey for each key, I did a turtle.onkeypress and turtle.onkeyrelease where when the key is down, it will add the key movement and when it is lifted, it will discard it. To make it more noticeable that there are levels, I added like a title of what level it is. Additionally, I feel like its kind of boring so I might add some timer or coins you can collect in order to go to the next level in the next session. The colours are also horrible lol.