lv3's answer is the firstname of the creator of morse code so it goes like this
walrus = morse, tap screen you get morse code, and the morse code translated means... abolutely nth, either that or he messed up the morse code part (then i tried everything that is even remotely related to morse code...) oh, and the answer is on #25, what steve_w_7 posted
lv5 i got past unknowingly after i got past lv3 (lv4 is easy...) so it's definitely passable, but i have no idea what i did to get past it lol, now i went back to lv5 and regret it cause i can't figure it out...
only thing i found out so far is that symbol is lower case sigma in greek, anyone else have more info we can go on?
EDIT: btw, this might be misleading but apparently sigma Oct means a star/planet in octantis sector. Nasa stuff... not sure if it means anything