Level 1. SIMON, SIN, SON
Level 2. GOD, DOG, DOUGH, HUG
Level 3. RED, DEER, GREED, EDGE
Level 4. HUT, RUT, HURT, TRUTH, RUTH
Level 5. BEE, BED, DEER, BREED, RED
Level 6. BITE, RITE, TRIBE, TIRE
Level 7. NORM, ROOM, MOON, MORN
Level 8. SHOT, HOST, SOUTH, SHOUT, SHUT