Level 1. PECK, SPECK, SPEC
Level 2. GALE, EAGLE, GLEE
Level 3. TAR, RAT, TRIAL, TRAIL, ART
Level 4. COT, COST, STOCK, SOCK
Level 5. TRIG, GRIT, RIGHT, GIRTH, HIT
Level 6. SAIL, NAIL, SLAIN, SNAIL
Level 7. BUFF, FLUB, BLUFF, FLU
Level 8. INK, SIN, SINK, SING, SKIN, KINGS, SIGN
