Hello everyone, nice to welcome you on our site, this page even has Level 13 answers. I enjoy it =D
Level 13 - GWGNOIR
The answer to this puzzle is:
Words: GORING, ROWING, GRINGO, GROIN, GIRON, GROWN, WRING, OWING, NOIR, INRO, GRIG, NORI, GROG, WINO, GIRO, IRON, GRIN, GONG, WING, WORN, GROW, GIRN, WIG, GIN, NOG, GIG, ION, WIN, NOR, WOG, WON
Bonus words:
GORING, ROWING, GRINGO, GROIN, GIRON, GROWN, WRING, OWING, NOIR, INRO, GRIG, NORI, GROG, WINO, GIRO, IRON, GRIN, GONG, WING, WORN, GROW, GIRN, WIG, GIN, NOG, GIG, ION, WIN, NOR, WOG, WON