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Level 12 - IMGHITDN
The answer to this puzzle is:
Words: TIDING, NITID, DIGHT, THING, DING, HIND, MIND, IMID, THIN, INTI, DINT, NIGH, TING, MIDI, NTH, GIN, NIT, GIT, DIT, DIN, DIG, MID, HIM, HID
Bonus words:
TIDING, NITID, DIGHT, THING, DING, HIND, MIND, IMID, THIN, INTI, DINT, NIGH, TING, MIDI, NTH, GIN, NIT, GIT, DIT, DIN, DIG, MID, HIM, HID