Blue's Clues

We zoom in on the Blue's Clues house, looking to come inside, but Steve meets us outside. He takes us to the backyard, where it seems that Blue has found a mysterious box. Blue and Steve speculate about what could be inside - Steve hopes it's a rocketship. Blue opens it and finds, to Steve's disappointment, that it's empty. He suggests that they'll have to play something else, like backgammon, but Blue puts on a helmet and pretends that the box is a rocketship. Steve joins in, realizing that Blue has found a great way to use the box. In this episode, we find all sorts of uses for the box. Steve has fun driving it around as a car. Shovel and Pail find it and use it to pretend that they're rowing a boat, then as a firetruck to put out fires and finally as a restaurant. Later, in the Blue Skiddoo segment, we get a call from a mysterious friend in a high tower. We use the box to cross a wide path and then a snowy hill and finally imagine it to be an elevator so that we don't have to use the stairs to reach the top of the high tower.

In this episode, Steve plays Blue's Clues to figure out what else Blue wants to play with the box. The three clues in this episode are:

Clue 1: [highlight to see]Wheels[/highlight to see]

Clue 2: [highlight to see]Tracks[/highlight to see]

Clue 3: [highlight to see]A Line That Goes Up and Down[/highlight to see]

Based on one or more of these clues, can you figure out what else Blue wants to play with the box? The correct answer is:
[highlight to see]A Rollercoaster[/highlight to see]