Step One:
After you talk to Liza the Alpha, talk to one of the only necessary bunnies in this adventure, Pumpkin. She will give you a plug for the nearest pipe (that should be next to you.)
Step Two:
Gather the corks around the map territory and plug the pipes. Beware, it may take a while.
The corks aren't that hard to find so I'll leave it up to you. BUT, Phantoms will be almost everywhere. There will be six corks in total (including the one Pumpkin gives you.)
Step Three:
Simple, water the plants once you've plugged the pipes.
Step Four:
After you've completed Step Three, find Binky in the Bunny Town, go all the way down inside her burrow, then talk to Clover, who will give you a key. After that, find the Phantom Gate, unlock, and proceed carefully.
Step Five:
Search the area within the Phantom Gate for keys to save the cadged bunnies. There are four keys.
Animal Perks for: Arctic Wolves
Correct me if I'm wrong, but I believe those are the locations of the keys on hard mode.
Thanks for reading,
AJ Wisdom