Change quest to work like "RL"

#763
Still need to:
```
1. move the stone
2. delete what is under the sacrificial stone
3. make sure you are able to select the "empty pipe"
4. move the sacrificial stone back
```
So it is possible to place the brain on the sacrificial stone

--Note: might be good to wait with merging until it is possible to place the brain on the altar?