This page contains information about content that was previously in the game but now got removed.
Level 172 was the second level in Cotton Carnival and the 24th candy order level in Dreamworld.
To pass this level, you must collect 40 yellow candies and 40 green candies in 21 moves or fewer.
When you complete the level, Sugar Crush is activated and will score you additional points.
This is the same thing as level 157, so you should have no problem redoing that level.
Moon struck will prevent candies matching both colours on the moon scale from spawning. If any required colour appears on either side, four additional candies have to be collected in addition to the 2 candies the player has to collect two moves after the moon struck. 
Moon Scale Edit
Moon Struck Edit
1st Start: moves left.
1st End: moves left.
Moon Struck moves
Repeat the strategy at level 157, except now, be careful with Odus and its moon scale.
(Reality-Level 157 Strategy: "Avoid making unnecessary moves. Focus your moves at the bottom, as it can create cascades which can collect more candies.")
This level was completely different than its counterpart in Reality for unintended reasons.
This level was exactly the same as level 157.
It was the only level that was the copy of another that was not redesigned.
This is the first jelly level in Reality that was replaced by a candy order level in Dreamworld.
This was one of the few levels in this episode that did not have any four-layered icing.
↑ 40 candies × ((1 move + 1 move) / 21 moves) = 3.81 candies
↑ This assumes that the start of the moon struck removes less than the number of required candies whose colour appears on the moon scale.
Candy Crush Saga Dreamworld Level 172 (Traumwelt)
Candy Crush Saga Dreamworld Level 172 No Booster 3 Stars
Web version (episode's placeholder background)