Level 1. ORB, BOOK, ROOK, BRO
Level 2. RIB, RISK, BRISK, SKI
Level 3. SOY, SOB, BOSS, BOSSY
Level 4. TEN, TON, NET, ONE, NOTE, KNOT, TONE, TOKEN
Level 5. RAM, ARM, JAM, MAJOR, OAR
Level 6. FIR, FIB, FIRE, BRIE, BRIEF, FIBER, RIFE
Level 7. HEAL, LASH, SALE, LEASH, SEAL
Level 8. SET, TEA, SEA, EAT, STEAK, STAKE, SKATE, ASK
