I had problem on level 2121 which all the numbers and letters disappear.

Kunsoo_Shin

I followed after get answer which un-install and re-install 

there was nothing different but lost all my boosters

Randle

Hey Kunsoo,

What model iPad are you playing this on? I´ve read on here that some iPad models are having issues with their games

https://care.king.com/en/bubble-witch-2-saga/problems-with-your-games-crashing-loading-on-certain-ios-devices