Easy as pie, but clearing the binds on floor 3 might be the most annoying thing in the history of this game.
Here's how it went:
Floor 1: Matched five water orbs, three light, and three green. Because I did not do the math right and forgot to target a Mythlit, I ended up with all three Mythlits and an Emelit alive. Luckily, the Mythlits all did Fire Bind, so I was able to clear the Emelit and one Mythlit on the second turn. Had I done things right, I probably could have dropped all but two Mythlits on the first turn, but PAD is no fun if you don't just plain screw up a few times.
After that, I matched hearts and orbs until I got rid of the second Mythlit and waited until Lilith was charged up. One thing that helps, if you weren't already aware, is matching the colors that are bound so your skill cooldowns tick off but you don't actually do any damage. About the time Lilith charged up, my binds were all at 2 turns or less, so I finished off the final Mythlit.
Floor 2: Took one turn to get fully healed and let the last of my binds clear, then popped Lilith and said bye bye.
Floor 3: Immediately popped Echidna, targeted one Dub-mythlit, and started matching. My first match was a mass light attack with solo attacks for fire, dark, and water. After that, I didn't use any more mass attacks. It really helped me here to write down how much damage I had done to each thing so I could keep track. After three turns, I had the right Dub at 4 HP, so I switched to target the left one and worked on him (hitting the right one for more than 4 would have potentially wasted damage because the overflow would have gone on the Tama). At some point, the Tama came back and bound Lilith, but he was nice enough not to bind anyone else while I cleared the Dubs. Then it was a matter of matching a few more orbs (mostly green or bound colors to avoid doing damage) to get the rest of my cooldowns finished, at which point I swapped two orbs in the corner of the board about 1,000 times until I got my binds sorted out. Eventually, I had (I think) a 1 turn bind on Hera-Is and my friend Zeus, so I popped Lilith and said bye bye.
Floor 4: Echidna and all four gravities. At that point it took me two turns to burst the twins down.