RULE: Change ONLY one letter at a time and form a new word at each step.


#1 Change TEN to TWO.                      #2 Change TEN to SIX.
        T E N                                  T E N 
        T o N                                  T I N 
        T O o                                  S I N 
        T W o                                  S I X

#3 Change FIVE to FOUR.                     #4 Change PIG to STY
        F I V E                                P I G 
        F I l E                                w I G 
        F i l L                                w A G
        f a l l                                w A Y
        f a i l                                s A Y
        F O I L                                S T Y
        F O u L                                
        F O U R
     

#5 Change TEN to ONE.

           T E N
           t i n      a metal 
           t i p      tilt 
           l i p      edge 
           l i d      cover 
           a i d      help 
           a n d      with ( a conjunction)
           a n t      insect 
           a c t      perform
           a c e      a card 
           a r e      a form of "to be" 
           o r e      mineral
           O N E

#6 Change MAD to DOG.
	MAD
	LAD
	LAG
	LOG
	DOG

#7 Change LEAD to GOLD in four steps.
	LEAD
	MEAD
	MELD
	MOLD
	GOLD

#8 Change TIME to WARP in four moves.
	TIME
	TAME
	TARE
	WARE
	WARP

#9 Change GRASS to GREEN!
   	GRASS   GRASS   GRASS   GRASS   GRASS   GRASS   GRASS
	CRASS   GROSS   GLASS   TRASS   BRASS   GRABS   CRASS
	CRESS   GROWS   GLOSS   TRESS   BRANS   CRABS   CRAPS
	TRESS   GROWN   FLOSS   TREES   BRAND   CRIBS   TRAPS
	TREES   GROIN   FLOES   TREEN   BLAND   CRIES   TRIPS
	FREES   GROAN   FLEES   GREEN   BLEND   CRIER   TRIES
	FREED   GROAT   FREES           BLEED   CRIED   TREES
	GREED   GREAT   FREED           BREED   CREED   TREED
	GREEN   GREET   GREED           GREED   GREED   GREED
	        GREEN   GREEN           GREEN   GREEN   GREEN

      Martin Round sent in another solution:
      GRASS CRASS CROSS CROPS DROPS DRIPS DRIES DRIED CRIED CREED GREED GREEN

#10 Change HEAD to TAIL.
        HEAD   HEAD   HEAD   HEAD
        HEAL   HEAL   READ   HEAL
        SEAL   TEAL   REID   HELL
        SELL   TELL   RAID   TELL
        TELL   TALL   RAIL   TALL
        TALL   TAIL   TAIL   TAIL
        TAIL

#11 Change WINTER to SUMMER.
	WINTER   WINTER
	WINNER   WINDER
	SINNER   WANDER
	SINNED   WARDER
	PINNED   WARNER	
	PUNNED   WARNED
	PUNTED   DARNED
	PANTED   DAMNED
	PARTED   DAMMED
	DARTED   HAMMED
	DARNED   HUMMED
	DAMNED   BUMMED
	DAMMED   SUMMED
	DIMMED   SUMMER
	DIMMER
	SIMMER
	SUMMER	

#12 Change STAR to WARS.
	STAR    STAR
	SEAR    SOAR
	SEAS    BOAR
	TEAS    BOAS
	TENS    BAAS
	TANS    BARS
	TARS    WARS
	WARS

#13 Change BOY to MAN.
	BOY     BOY
	TOY     BAY
	TON     MAY
	TAN     MAN
	MAN

#14 Change WOOD to FIRE.
	WOOD
	FOOD
	FORD
	FORE
	FIRE

#15 Change ARM to LEG.
	ARM
	AIM
	AIR
	FIR
	FIG
	BIG
	BEG
	LEG

#16 Change HAND TO FEET.
	HAND
	SAND
	SEND
	SEED
	FEED
	FEET