User blog comment:JoyIF/Hard Dreamworld Level Types/@comment-24525016-20140719050447

Any level types can be the hardest level in Dreamworld.

For jelly levels, the hardest levels are the ones whose Reality counterpart is time level, or has far fewer moves like 116 and 338.

For ingredient levels, any levels which have a large amount of ingredients to be brought down, like 87 (pre-nerf), 272 and 325, can be really hard.

For candy order levels, levels which require a very large amount of candies are also really hard, especially the levels whose Reality counterpart has only 4 colors. The examples are 276, 289 (the current hardest level in Dreamworld) and 339.