|20,000+||Grape (x3), Unison Blizzard Ability|
The idea behind this minigame is to reflect the ice chunks from the Flans to freeze them before grinding across the ice to take them out in one fell swoop. You can defeat them with conventional means also but note that it will take a lot longer to kill them this way.
This isn’t to suggest you should ignore those tactics however, if you see a large group bunched up then unleash a barrage of Thundara to take them out before resuming your reflecting of the ice chunks. It may take several times before you get the timing down for the reflect but once you do, you’ll reach the 20,000 score in no time at all. Your reward for this is Unison Blizzard and Grapes x3.