Elsa

Elsa is a Premium Box Tsum. For a limited time, while she was first introduced, she was a musical Tsum that played the song "Let It Go" during gameplay.

Information
Elsa Tsum has a unique skill where she will freeze the bottom layers of unfrozen Tsums which you can tap to create a large chain. Her base freeze radius is SS in the Japanese versio and XS in the International version.

Strategy
To get the most out of Elsa, wait for there to be no holes in between the Tsums, including any bubbles (or at least not many holes, as you want to use Elsa as many times as possible) and then use her skill.