Hello everyone, nice to welcome you on our site, this page even has Level 13 answers. I enjoy it =D
Level 13 - ERTRNIP
The answer to this puzzle is:
Words: REPRINT, PTERIN, REPIN, TRIPE, TRINE, TRIER, RIPEN, INEPT, PRIER, RIPER, NITER, INERT, NITRE, TINE, TERN, RITE, NITE, PERI, PENT, REIN, TIRE, PINT, PIER, PERT, RIPE, PER, RIP, TIP, PIN, ERR, TIN, REP, NIT, NIP, IRE, TEN
Bonus words:
REPRINT, PTERIN, REPIN, TRIPE, TRINE, TRIER, RIPEN, INEPT, PRIER, RIPER, NITER, INERT, NITRE, TINE, TERN, RITE, NITE, PERI, PENT, REIN, TIRE, PINT, PIER, PERT, RIPE, PER, RIP, TIP, PIN, ERR, TIN, REP, NIT, NIP, IRE, TEN