I had the problem, but here's how to do it.
1.Goto the Walls section.
2.Click the Gravity Wall.
3.The screen is now covered in a yellow thing. Place some actual Gravity Wall by holding somewhere. It makes a brighter thing.
4. Place a platform underneath using DMND or something. The whole screen is now not covered in the dark yellow, but only the bright yellow remains.
5.Select STKM and place it above the Gravity Wall. It now has rocket boosters which enable it to fly and emits super-hot PLSM that doesn't kill itself!
Yes , Yes it is.
Actually, I saw a couple of users who didn't know so I decided to post this thread. Being on for a long time, OF COURSE you would know.
no, some guys will say like OOHH i have rocket boots and noobs say
HOW THE F DID YOU DO THAT HACKER -1 AND REPORT