99FL

99FL was the 99th floor in Tower of Frozen Waves and is one of the boss stages. While the first mission is not so hard, the second and third missions require a lot of trials and errors.

Stage
There are many Winged Jellies and carefully-placed obstacles that players have to avoid to complete the third mission and second mission, respectively.

It may seem easier than the previous floor, but once you realize how hard it is, you would agree on it and never change your mind.

Collect more than 142 Winged Jellies
Reward: 7

Collecting Winged Jellies isn't so hard, if you pay attention to the stage. The mission has a medium tolerance, so you can leave out a few Winged Jellies if you miss any.

Don't collide with any obstacle
Reward: 3

This requires more than just a few runs. You would have to understand the stage and pay attention to every obstacle in the stage. One hit and you're out.

Of course, if you're fearful of colliding, have a really laggy phone, or you're just too clumsy, equip a Sacred Protection Ring of Fire or two. Also, having Amateur's Baking Powder is an extra bonus as there are several potions throughout the floor, enabling you to become Giant, hence not having to worry about the obstacles for that 1-2 seconds.

Collect less than 4 Winged Jellies
Reward: 10

This is the opposite of the first mission: you have to avoid the Winged Jellies. You would have to jump carefully to avoid the Winged Jellies. One massive, clumsy mistake and you're out.

And this is why you should never take Shiny Golden Nunchaku or Uncooling Teacup's Golden Jujube Tea Bag with you for this mission. If anything, your jumps must be very, very accurate. Bump into an obstacle if you feel that you need to, just to avoid the winged jellies.