Hello everyone, nice to welcome you on our site, this page even has Level 4 answers. I enjoy it =D
Level 4 - NIUOILSL
The answer to this puzzle is:
Words: INSOUL, LINOS, LOINS, LILOS, NULLS, NOILS, LOUIS, NILLS, NILS, LILO, LINO, NISI, ONUS, LINS, SOLI, SILL, LOIN, OILS, NOUS, NULL, IONS, ILLS, INS, SUN, NOS, SOU, SON, LIN, NIL, SOL
Bonus words:
INSOUL, LINOS, LOINS, LILOS, NULLS, NOILS, LOUIS, NILLS, NILS, LILO, LINO, NISI, ONUS, LINS, SOLI, SILL, LOIN, OILS, NOUS, NULL, IONS, ILLS, INS, SUN, NOS, SOU, SON, LIN, NIL, SOL