Hello everyone, nice to welcome you on our site, this page even has Level 4 answers. I enjoy it =D
Level 4 - KCEOIOS
The answer to this puzzle is:
Words: SICKO, COKES, COOKS, COSIE, SOCKO, SOKE, COOS, ICES, SIC, SEC, COO, COS
Bonus words:
SICKO, COKES, COOKS, COSIE, SOCKO, SOKE, COOS, ICES, SIC, SEC, COO, COS