Hello everyone, nice to welcome you on our site, this page even has Level 4 answers. I enjoy it =D
Level 4 - IRENSWN
The answer to this puzzle is:
Words: RENINS, REWINS, INNERS, SINNER, SINEW, WIRES, WRENS, SERIN, RENIN, WEIRS, REINS, REWIN, WISER, NINES, WEIR, SEWN, REIS, SINE, WREN, WIRE, RISE, REIN, ERNS, INNS, RINS, WIN, WEN, INS, RES, INN, SIN, SEN, SER, NEW, IRE, SEW, SIR
Bonus words:
RENINS, REWINS, INNERS, SINNER, SINEW, WIRES, WRENS, SERIN, RENIN, WEIRS, REINS, REWIN, WISER, NINES, WEIR, SEWN, REIS, SINE, WREN, WIRE, RISE, REIN, ERNS, INNS, RINS, WIN, WEN, INS, RES, INN, SIN, SEN, SER, NEW, IRE, SEW, SIR