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Level 20 - NDEXPPIA
The answer to this puzzle is:
Words: APPEND, NAPPIE, NIPPED, NAPPED, PAINED, NIXED, XENIA, PIPED, PANED, PINED, NAPPE, PIAN, NAPE, PADI, NEAP, NIPA, PINA, AXED, DENI, APED, PAID, PIED, AIDE, APEX, PAD, APE, END, DEN, APP, DIE, AID, PEN, DIN, PAN, PIX, NAP, NIX, PAP, NIP, PEP, PIP, ANI, AND
Bonus words:
APPEND, NAPPIE, NIPPED, NAPPED, PAINED, NIXED, XENIA, PIPED, PANED, PINED, NAPPE, PIAN, NAPE, PADI, NEAP, NIPA, PINA, AXED, DENI, APED, PAID, PIED, AIDE, APEX, PAD, APE, END, DEN, APP, DIE, AID, PEN, DIN, PAN, PIX, NAP, NIX, PAP, NIP, PEP, PIP, ANI, AND