If you are RNG god, then 20 stamina Intermediate map is best to farm as it gives 2.25 stones per stamina. You can have max 3 girls go through random node, and they have only one go at it, so you have 12,5% chance to fail and not collect 2 of 3 chest that have 15 stones each. Thus on average you should have actually 41.25 stones per run (instead of 45 if you are RNG god) which is 2.0625 stones/stamina, the same value as Ultimate 80 stamina map (5 chest 33 stones each).

So if you are good with RNG you can farm Intermediate map, will yield more stones and exp per stamina. If you are thou bad with RNG and don't care much about exp efficiency then Ultimate is better.

Beginner yields only 1.8 stones/stamina (thou is best in terms on exp/stamina). Advanced is kinda RNG bullshit type of map in my opinion. There is probably a proper setup (I run 1 team each in the left bottom spots and 3 in upper middle - the single team that needs to leap few times around spider webs had Lilac and a high squad speed) but even with max numbers of teams running through random node close to chest-loops including the extra speed running after one team reached end flag - I still managed to get f**ked by RNG and missed 2 of those 3 chests once in like 4 runs.

For Ultimate I used the 4 top 1 4th row set-up someone wrote on that map page. Worked flawlessly for me on first try (all squads including helper were around 500+-40 speed). But I assume any split between those two start nodes will work.

EDIT:
Just tried Ultimate map with this set-up:

Originally Posted by Unregistered

Just switch the helper squad to the empty camp. Leave everyone else at default.

I find it more hard to do as moving helper to click green button and let top pests fly around and hurt teams adds to difficulty, nevertheless it still was a 3 medal run.

This one I'll pass unless there's a flower gem. My Star Lily was already maxed up from the original event.

Originally Posted by Discoceris

This one I'll pass unless there's a flower gem. My Star Lily was already maxed up from the original event.

Same here, I´ll get her only to get a FG from her. And yes in the 80 stamina map if you get 3 medals you will also get a FG.

Putting the helper squad on the empty camp worked for me. Also, aside from FG is there any point on getting the girls in reissue?

Originally Posted by LastSensei

Putting the helper squad on the empty camp worked for me. Also, aside from FG is there any point on getting the girls in reissue?

later on you will need as many girls from different nations and of different attack types as possible (will need at least 16 of each attack type for whaleship missions)

Her abilities are a bit meh but she is not that bad in term of TP. At least better than a lot of other event girls. She canbe a good option to replace another bad event girl if you need some Pierce type.

If you already got 3 medals on Ultimate map and just want to farm it for stones (aka chests) it seems that best way is to keep 1 squad on each of two top most start nodes (there are squads there by default) and move 2 teams to helper bottom start node. This assumes each of top teams can fight and survive at least one pest (50k power per those squads seems to be enough), and 2 of 3 bottom squads will be strong enough to go through small pests and 2 bosses to the finish flag (a 70k power squad seems to be enough to solo it thou so you could improvise a bit).