Hello everyone, nice to welcome you on our site, this page even has Level 4 answers. I enjoy it =D
Level 4 - GISINMWM
The answer to this puzzle is:
Words: MIMING, WIMMIN, WISING, MINIMS, MINIS, MINIM, MIGS, IWIS, NISI, WIGS, SWIG, GINS, SIM, INS, GIN
Bonus words:
MIMING, WIMMIN, WISING, MINIMS, MINIS, MINIM, MIGS, IWIS, NISI, WIGS, SWIG, GINS, SIM, INS, GIN