Mt. Magnet introduces the Magnet Block to players. It is one of the first levels of World 2. Since World 1 introduced the player to the Ghost, Spring, and Gum Blocks, World 2 will continue adding to the player’s repertoire by adding the Speed, Magnet, and Platform Blocks. World 3 will finally introduce the Gravity and Box Blocks, while World 4 will routinely use all of them for the final challenges before the end of the game.
In order to focus on the player learning the ins and outs of switching magnet polarity, I opted to not put any enemies whatsoever in the level, allowing them to focus on the tasks at hand.
The final challenge – the spiked platform near the end of the level – has two separate ways to cross it; the way shown in the video (repelling over it), or, to get the coins underneath, the player can carry the box from earlier with them and use it as a shield against the spikes as they attract up from beneath.