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Level 1 - DRRAET
The answer to this puzzle is:
Words: DARTER, TARRED, RETARD, TARRE, DREAR, TARED, RARED, DERAT, RATER, DATER, DARER, TREAD, TRAD, TEAR, DRAT, TARE, TED, ATE, TAR, TAD, RAD, ETA, ERR, RAT, ERA, EAT, ARE
Bonus words:
DARTER, TARRED, RETARD, TARRE, DREAR, TARED, RARED, DERAT, RATER, DATER, DARER, TREAD, TRAD, TEAR, DRAT, TARE, TED, ATE, TAR, TAD, RAD, ETA, ERR, RAT, ERA, EAT, ARE