Level 1. VISA, VAIN, VANISH, SHIN
Level 2. DIRE, RIDE, RILE, RIDDLE, IDLE
Level 3. INTO, ANOINT, NATION, ANTI
Level 4. FLIT, LIFT, FILTH, FILTHY, HILT
Level 5. COOL, LOON, ONLY, COLON, COLONY, LOCO
Level 6. CARD, CARE, CASE, DARE, RACE, READ, SACRED, SCARED, DEAR
Level 7. EDGE, GENE, GLEE, GLEN, LEND, LEDGE, LEGEND, NEED
Level 8. BARD, BOAR, ROAD, BOARD, BROAD, ABOARD, ABROAD, DRAB
