You have experienced some Stone Age!
Could they be a picture of something which doesn't have its own picture? Like of words?
Get 600 points
Get 500 points
Get 450 points
Get 380 points
Observe the drawings fade away
Get 400 points
Create a new type of a spearhead
Just some marks on the wall...
Get 300 points
Get 350 points
Get 230 points
Get 270 points
Get 200 points
Get 150 points
Get 80 points
Get 20 points for beating stones with stones
Get 50 points