Hello everyone, nice to welcome you on our site, this page even has Level 13 answers. I enjoy it =D
Level 13 - MMMHAOT
The answer to this puzzle is:
Words: MATH, OAT, MOT, THO, TAM, TOM, HOT, HMM, HAT
Bonus words:
MATH, OAT, MOT, THO, TAM, TOM, HOT, HMM, HAT