Tilaa ladataksesi
See if you can do it

I tried to think of a 3x3x3 stage because of someone named mr.anonymous. Definitely check him out because of his epic 3x3x3 maps.
Anyway, I wanted to change it and put a faith plate in it.
I'll be honest, my method is hard, and is probably something to do with strafing.

SPOILERS IF YOU CANNOT SOLVE: (How I solved it)
1. Pop a portal on the surface below the target.
2. Pop the other portal on the surface directly opposite the door, but maybe a little to the left of the middle line.
3. Fling yourself on the faith plate, and hold the A key a little, whilst looking left slightly.
4. Keep doing this until you eventually somehow make it through the door.

There are probably much better methods, but that was mine.