Hello everyone, nice to welcome you on our site, this page even has Level 12 answers. I enjoy it =D
Level 12 - BNUIRBG
The answer to this puzzle is:
Words: BURIN, BRUNG, RUING, BRUIN, UNRIG, BRIN, BUNG, BRIG, GRUB, GIRN, BURB, BURG, RUNG, BUB, BIG, GNU, RIG, BIB, GIN, NIB, NUB
Bonus words:
BURIN, BRUNG, RUING, BRUIN, UNRIG, BRIN, BUNG, BRIG, GRUB, GIRN, BURB, BURG, RUNG, BUB, BIG, GNU, RIG, BIB, GIN, NIB, NUB