Level 1. DOG, GOD, DIG, DOING, NOD
Level 2. SIN, SON, ICON, COIN, SCION
Level 3. RIG, RIB, BIG, RING, BRING, GRIN
Level 4. ARM, SHAM, RASH, MARSH, HARM
Level 5. SORT, SOOT, ROOT, ROOST
Level 6. ROW, OWN, NOW, GROW, WRONG, GOWN
Level 7. RATE, TEAR, HEAR, HEAT, HEART, EARTH
Level 8. AND, BAR, BAN, DRAB, BAND, BARD, BRAN, BARN, BRAND, BAD
