Hello everyone, nice to welcome you on our site, this page even has Level 15 answers. I enjoy it =D
Level 15 - GNNIRGA
The answer to this puzzle is:
Words: GRINGA, RAGING, GARNI, GNAR, GIGA, AGIN, GRIG, RANI, GRAN, IRAN, RIGA, AIRN, GIRN, RANG, ANI, RAN, NAN, GAR, GIN
Bonus words:
GRINGA, RAGING, GARNI, GNAR, GIGA, AGIN, GRIG, RANI, GRAN, IRAN, RIGA, AIRN, GIRN, RANG, ANI, RAN, NAN, GAR, GIN