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Level 15 - ULVITAR
The answer to this puzzle is:
Words: VIRTU, URIAL, VAIL, LARI, TALI, LIRA, LATI, RIAL, ARIL, LITU, AIRT, LATU, ALIT, VITA, RUT, LUV, TIL, LIT, AIR, VIA, ART, TAR, VAR, LAT, AIL, TAU, VAT, ALT, RAT
Bonus words:
VIRTU, URIAL, VAIL, LARI, TALI, LIRA, LATI, RIAL, ARIL, LITU, AIRT, LATU, ALIT, VITA, RUT, LUV, TIL, LIT, AIR, VIA, ART, TAR, VAR, LAT, AIL, TAU, VAT, ALT, RAT