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Level 18 - ITHGLIWT
The answer to this puzzle is:
Words: TWILIT, WIGHT, TILTH, HILI, WHIG, TITI, TWIG, TWIT, WHIT, WILT, GILT, GIT, WIG, TIL, TIT
Bonus words:
TWILIT, WIGHT, TILTH, HILI, WHIG, TITI, TWIG, TWIT, WHIT, WILT, GILT, GIT, WIG, TIL, TIT