This level has many "lightning bolt" formations throughout.
The level can be completed by jumping on top of these formations, and jumping to the next one. they are arranged in a "dashed line", hence the name of the level. Just follow the dashed line, and you will complete the level without much trouble.
To get the bonus, you must catch onto the right side of the second lightning bolt formation in the level, and follow the dashed line. The bonus will be in a "stair" of 2 blocks, where your character can stop, jump, and finish the level.