You can use hint here if you need.

Level 1 : Make stair steps pattern with 2 lines of code.

Level 2 : Make use of snake's screen loop

Level 3 : Try to collect the middle right apple first

Level 4 : Go down first. You don't need 4 lines.

Level 5 : You must AVOID to collect any apple in the FIRST LOOP. (Yes, this one need full 5 lines)

Level 6 : Make use of THAT NEW FEATURE!

Level 7 : Again, make use of screen loop

You are good to go now, good luck!