Combo tile challenge is one of three new challenges released during April 2017 (version: 22.214.171.1248). It can be found in the hall tab, under the gameplay section. It costs two hearts to play and combines single tiles, holding tiles, double tiles and combo tiles.
The player can earn stars and crowns from this challenge.
The world record is 14.545 by Glory YT and the world record shown in game is 12.916.