Hello everyone, nice to welcome you on our site, this page even has Level 1 answers. I enjoy it =D
Level 1 - SNVTIIGI
The answer to this puzzle is:
Words: VISING, SITING, INTIS, TINGS, TINS, TING, NITS, GINS, INTI, NISI, GITS, SNIT, INS, NIT, GIN, GIT, ITS
Bonus words:
VISING, SITING, INTIS, TINGS, TINS, TING, NITS, GINS, INTI, NISI, GITS, SNIT, INS, NIT, GIN, GIT, ITS