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Level 21 - TIENWR
The answer to this puzzle is:
Words: TWINER, INERT, TWINE, TWIER, REWIN, TRINE, NITER, NITRE, NITE, RITE, TERN, TINE, NEWT, WEIR, REIN, WENT, WERT, WREN, WRIT, WEN, NIT, IRE, TEN
Bonus words:
TWINER, INERT, TWINE, TWIER, REWIN, TRINE, NITER, NITRE, NITE, RITE, TERN, TINE, NEWT, WEIR, REIN, WENT, WERT, WREN, WRIT, WEN, NIT, IRE, TEN