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Level 1 - IRRDENEE
The answer to this puzzle is:
Words: NEEDIER, DERNIER, NERDIER, REEDIER, REINED, NEEDER, NEREID, EERIER, DENIER, EIDER, DIENE, DIRER, ERRED, DRIER, ENDER, REED, EIDE, DREE, DENI, RIND, REDE, ERNE, REIN, DERE, DENE, RID, DIN, ERR, RED, ERE, NEE, IRE
Bonus words:
NEEDIER, DERNIER, NERDIER, REEDIER, REINED, NEEDER, NEREID, EERIER, DENIER, EIDER, DIENE, DIRER, ERRED, DRIER, ENDER, REED, EIDE, DREE, DENI, RIND, REDE, ERNE, REIN, DERE, DENE, RID, DIN, ERR, RED, ERE, NEE, IRE