This is the first level of the Winter Games, and if you haven't found this tunnel yet, you will need to beat Level 15 first in order to play this level.
If you are confident enough, you can use the Skater. He is real fast, so he can jump across multiple platforms.
But now, let's focus on the Runner.
Since the ramps are great for short jumping, Runner should be able to pass through the level easily, but you are scared and want some emotional support/jump farther, you can jump on the ramp. You can jump farther.
You should be able to pass this level easily.