15FL

15FL is the 15th floor in Tower of Frozen Waves.

Stage
This stage has many obstacles that can freeze Cookies, and that can be an advantage or disadvantage depends on the mission.

Finish the stage within 95 seconds
Reward: 2 For this mission, players might want to equip any treasure that increases Cookies' base speed, like Forgotten Stocking's Patch or First Harvest Olive Oil. Colliding with obstacles will makes the Cookies slow down, so to prevent that, it'd be a great choice to equip some treasures that can destroy obstacles here, such as Jellyco Cube's Lost Jellyco. And since there are several mini potion in this stage, any treasure that gives a Blast after taking a Potion (like Candy Roller Skates or Marshmallow Hamster's Chocolate Sunflower Seed) might also be an option.

Run for at least 103 seconds
Reward: 1 Unlike first mission, for this mission players need to deliberately collide into obstacles a couple of times, especially into ones that freeze Cookies. This is an important part as a way to waste the time, or else the Cookies will reach the gate before 103-second time limit. And just in case the Cookies run out their energy before reaching the gate, it is advisable to equip some treasures that give revival ability, such as Brave Cookie's Skeleton Necklace or Muay Thai Cookie's Super Tight Hair Tie.

Collect at least 570 Frozen Bear Jellies
Reward: 800 Treasures that may generate a Jellyco shower like Flaming Red Jellyco would be very helpful here, as when they drop regular jellies while All-Frozen Bear Jelly Parties are in effect, they not only destroy obstacles, but also provide more Frozen Bear Jellies. For additional help, players can also equip treasures that give extra jumps such as Caramel Chocolate Energy Bar or Ninja Cookie's Tree Leaf to catch more jellies in the air.