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Level B-13 is the fifth course in the Bonus 2 set and the thirteenth Bonus Level overall in Mario vs. Donkey Kong: Tipping Stars. It is set in Orbiting Observatory and is unlocked by earning 52 trophies.
The course contains several Magnets arranged among normal platforms. There are also Purple Conveyor Rivets to help form connections between platforms, as well as High Spring slots that can bounce the Minis up to the Magnets above when made functional. One Mini Mario starts on one side of a spike-filled pit on the bottom floor, flanked by Purple Conveyor Rivets. The other Mini Mario starts on the same floor, between two High Spring slots beyond the pit, while the Mini DKs start next to each other on a platform higher up.
Using a High Spring, the Minis must first reach for the branching Magnet formation on the right. The direction followed by the Minis before bouncing off the spring causes them to walk counterclockwise around the Magnet formation, which prevents them from climbing to a platform with a pair of Hammers on the right. To change their direction, the player should draw an opposing Purple Conveyor from the platform higher on the left to the rivet in the center of the formation. This will cause the toys to round the Magnet formation again clockwise, eventually returning to the same spot, from where the player should draw another Purple Conveyor leading up to the platform with the Hammers. After picking up the weapons and falling off the platform, the Minis will encounter a Shy Guy which they will destroy, then walk a little further to find the Goal Door.
The M Coin is located on a platform at the top left. The player should build an horizontal Purple Conveyor leading to this platform and make the Minis bounce from a High Spring onto the Magnet on the ceiling. They will eventually drop off the Magnet and land on the conveyor, which will glide them to the coin.