×Snake must prevent tar babies from actually spawning in force arrows area. To do that, you must time everything right.

×It seems you are going through trapdoors too early.

the order things need to be done:

1. Wait for the tar blob in force arrows area to grow a lot and spawn tar baby at 11,8. It will kill upper snake.
2. Wait for upper tar blob(14,5-15,6) to grow once.
3. Kill tar mother.
4. The other serpent is no longer needed, you can safely go through trapdoors.
5. Hit the orb at 13,5, kill roaches.

×Yeah, the serpent circles at 11,15-15,16 area

×I assume by "orb in the corner" you mean ones at 6,22 or 7,23 or anywhere near them(right-click to see square coordinates)?

If so - you must not hit them. You must not go through the passage with them, either - that passage is for serpent.

Go through trapdoor path instead

×if Beethro is at (22,16) then snake will not enter arrow

×you may want to break crumble wall and kill tar mother later

×you need a tar baby to kill upper snake