This might have changed again, just did a green chest and Area 3 Stage 6 was only 3 to 5 green kills. I checked out the first 12 areas and ran the ones that were all green enemies (albeit only once each) and got this:
| Level | WE | Green Kills | Regular or Elite stage |
|---|---|---|---|
| 1-4 | 3 | 3 | Regular |
| 3-6 | 3 | 4 | Regular |
| 4-3 | 3 | 11 | Elite |
| 8-4 | 3 | 11 | Elite |
| 8-5 | 3 | 10 | Regular |
| 8-7 | 3 | 9 | Regular |
| 11-1 | 4 | 9 | Regular |
| 11-4 | 4 | 11 | Elite |
| 11-5 | 4 | 10 | Regular |
| 11-7 | 4 | 11 | Elite |
| 11-9 | 4 | 11 | Regular |
So 4-3 and 8-4 were tied for best today (I know you’ll want more data for a full analysis but maybe this can help people in the meantime)