Level 1. LOG, GOAL, LOAN, LONG, ALONG, ANGLO, GAL
Level 2. ELM, BLUE, LURE, RULE, LUMBER, RUB
Level 3. CELL, CELLO, CLONE, COLON, COLONEL, COOL
Level 4. DROP, POOR, POUR, PROD, ROOT, ROUT, DROPOUT, TOUR
Level 5. CANT, COAT, COIN, ICON, ACTION, INTO
Level 6. DOE, EVE, LED, DELVE, LOVED, DEVOLVE, OLD
Level 7. DUST, SUIT, STUDIO, STUD
Level 8. GEM, IRE, RIG, GRIME, MERGE, REGIME, RIM