Magnet.

After the second input has been received, the door into the chamber split into two automatically, letting Jen inside. The chamber was rather spacey and mostly white, yet still much smaller than the first hall. The floor consisted of soft-ish blocks with a side of 6 to 7 feet that simulated uneven terrain and had many different grips sticking out all over the place.

"With the right equipment, it must be fairly easy to replace these blocks with... other blocks."

*SNAP*

It took one to snap Jen into full focus on the target. The signal was fairly late, so the key must have been deep in there. The girl ran towards the center just to cut some distance, so she could be closer to the key, no matter how quick she would be able to spot it. As she neared the center of the chamber, the lights on the ceiling got a little dimmer, and, quite abruptly, her advance was stopped, as if her belt was on a chain and she yanked at it real hard.

But there was no such thing. Nothing alien was attached to it, and yet it would not move along with her. Jen went as far as lifting her feet away from the ground, putting all her humble weight on the belt, and it probably started moving towards the floor, ever so slightly.

Once she was low enough to grab the floor grips, the girl was able to pull herself forward quicker, although it required more effort than before. It felt like the usually insignificant air resistance to movement was multiplied in regards to metal objects, and this one around her waist was valiatly resisting Jen's efforts to get closer to the key.

It felt like trying to move a large stone along with her, but still, she was progressing. There were several times when she though she saw some kind of recess that could be storing keys inside, but she could not afford to stop, as she remembered the second input to be 'Magnet'. A quick glance at the ceiling revealed some round surfaces hanging above every four blocks. It was entirely believable that these could be the magnets. Flying up to them would be game over.

Jen was tracking the intensity of snaps in her belt, making sure they were only increasing. Much to her concern, this increase was getting slower, until she traveled entire 40 feet without any progress. She kept looking for them hidey-holes and, as she turned her head around, she noticed an entire keyring rack sitting pretty on the back side of a regular uphill block. She could not see it until she was past it, but now it was a race. The girl just hoped there was enough time.

When she was almost there, the belt slowly gave up its ability to hold her in the air, and she fell down and even slid back down the slope a little bit. With no idea how much of an intermission she had, she gave out a battlecry and ran back up.

"Which one? There's, like, thirty there." — Jen's panting was sporadic, her tired hands were shaking. Did she check this one? The machine gun of snaps was not calming her down either, but left behind quite some ringing in her ears when she touched a tiny dark blue key.

The relief gave way to horror, as twenty nine other keys ascended upwards, stretching their flimsy keychains. Jen felt this **** picking her up by the waist as well. She quickly moved the keyhole to the key, but did not get it in on the first try. With a loud slip, her foot left the floor and did not find ground again.

The keychain snapped apart. The key remained in her fist right before her, and the floor behind it kept getting further away. She needed to get herself together before it was going to be too late.

It was in. A match. Now it stays in. One small turn. It's taking surprising amounts of effort...

*THUD*

When her vision uncloudied itself again, she was down on her fours. The belt was up there, open as ever, pressed tight against the magnet. The tiny key was there as well.

"Well. Time to get out until this falls back down onto me."

There were four exits from each side of the square chamber, but Jen had no intention of ending up in a random place again. She kind of remembered which one was hers, and sweaty grips along the way were good evidence to make her sure.

After Jen passed the door, it did not close automatically. It probably had some internal timer instead. Shutting the outer door closed on her way out, the girl climbed the ladder and looked around. All that was left was the dildo that started it all and, unfortunately, there were no clues to its key's whereabouts yet.