It's an ad-watching game.

I started the game because it had time quests and hidden quests, but there are too many ads in between. At first, you watch one ad, then two, and from level 11, you have to watch 3 ads to complete the level. Regardless of how well you play, you have to watch a fixed number of ads. When you match 3 of the same blocks, they disappear, and when a certain number of blocks are gone, an ad automatically plays. As the level increases, the number of blocks will likely increase, and as the number of blocks increases, the number of ads will probably increase too.