Level 258 was the thirteenth level in Marshmallow Madness and the 117th jelly level in Dreamworld. To pass this level, you must clear 16 double jelly squares in 35 moves or fewer.
When you complete the level, Sugar Crush is activated and will score you additional points.
There are ten fewer moves than its counterpart in Reality, which means fewer points can be earned from Sugar Crush, making it harder to reach the target score.
However, the candy bombs' timers are the same as the number of moves in the level, so you should have no problem with them exploding.