Hello everyone, nice to welcome you on our site, this page even has Level 18 answers. I enjoy it =D
Level 18 - EFENCFO
The answer to this puzzle is:
Words: CONE, COFF, OFF, CON, EFF, FEN, NEE, EON
Bonus words:
CONE, COFF, OFF, CON, EFF, FEN, NEE, EON