Which Candy Crush sequel introduced jelly-filled squares?

Candy Crush Jelly Saga introduced jelly-filled squares.

The sequel added board spaces containing jelly as a new level objective and gameplay mechanic. When candies occupying jelly-filled squares are matched, the affected spaces generally become or spread jelly, encouraging players to plan matches across the board rather than focus only on removing individual candies.

The goal in these stages is typically to fill all of the board's squares with jelly. This makes Jelly Saga easy to confuse with the original Candy Crush Saga, which also includes levels involving jelly-covered tiles. The distinction is that Jelly Saga made jelly-filled squares a defining sequel feature and paired them with new characters and modes.

Candy Crush Jelly Saga was soft-launched for Android in various countries in September 2015 and received a worldwide release in January 2016. It later expanded to iOS and Facebook. Candy Crush Soda Saga introduced floating candies and changing gravity, while Candy Crush Friends Saga arrived later with character-based powers, so neither is the answer here.