1. just enough to want you to keep going to the next level.Once you get to this level it gets boring, toooo complicated to pass it , and I play to entertain myself, not to get a headache, I do not recommend itgreat but too many ads it gets annoying and it doesn't keep awake you have to unlock it every 30seconds you don't play and the elimination booster hits empty spaces i wonder how but if i use one the other bursts to clear nothing but empty spaceslike the game doesn't tell you what to do each level just guess at it but keeps you wanting to play don't like ads after ea h level but deal with themI am on level 20 and it is still too easy.
2. Puzzle nearly plays itself.there's 1 more thing to add to my eariler message it doesn't show u what day it is on the daily bonus.
3. great game to pass away time.
4. Some levels easy, some challenging.