[intregus]

Same. It's really tough. I think the 3rd one is all that I'm missing, and I have no ideas for it.

[jibiki]

I'm pretty sure I have the third one, but not two or four.

[dnene]

And I'm sure I nailed first three but have no clue about the fourth. tried characters and numbers. Not sure if numbers should be attempted forward or reverse.

[profquail]

All four answers are just numbers.