Brain Teaser:
Do we really need the BACK command? Can we make the Turtle move backward using only the FORWARD and RIGHT commands?
Answer:
We actually can move the Turtle backward without using the BACK command. The following instructions do the same job as BK 100.
RT 180 FD 100 RT 180
Number 1
CS
RT
30 FD 50
RT
150 FD 200
RT
90 FD 50 BK 100
FD
50 RT 90
Stick at an angle
CS
RT 30
FD 250 RT 90 FD 20 RT 90
FD 250 RT 90 FD 20 RT 90
LT 30
Cross X
CS
RT 30
FD 100 BK 200 FD 100
LT 60
FD 100 BK 200 FD 100
RT 30
Logo Challenge: Hexagon with gaps
CS
PU FD 8 PD FD 100 PU FD 8 PD RT 60
PU FD 8 PD FD 100 PU FD 8 PD RT 60
PU FD 8 PD FD 100 PU FD 8 PD RT 60
PU FD 8 PD FD 100 PU FD 8 PD RT 60
PU FD 8 PD FD 100 PU FD 8 PD RT 60
PU FD 8 PD FD 100 PU FD 8 PD RT 60
Shapes in the Collage:
CS FD 200 BK 100 RT 90 FD 100 LT 90 FD 100 BK 200
CS
FD 100 RT 90
FD 100 RT 90
FD 100 RT 90
FD 100 RT 90
CS
FD 100 RT 90 FD 200 RT 90
FD 100 RT 90 FD 200 RT 90
CS
FD 50 RT 90 FD 50 LT 90
FD 50 RT 90 FD 50 LT 90
FD 50 RT 90 FD 50 LT 90
CS
FD 100 RT 90 FD 10 RT 90
FD 100 RT 90 FD 10 RT 90
PU FD 110 PD
FD 10 RT 90 FD 10 RT 90
FD 10 RT 90 FD 10 RT 90
PU BK 110 PD
CS
RT 45 BK 50 FD 100 BK 50 LT 90 BK 50 FD 100 BK 50 RT 45
CS
RT 90 FD 100 BK 100 LT 90 PU BK 20 PD
RT 90 FD 100 BK 100 LT 90 PU BK 20 PD
RT 90 FD 100 BK 100 LT 90 PU BK 20 PD
CS
FD 100 LT 90 FD 25 RT 120
FD 50 RT 120
FD 50 RT 120
FD 50 RT 120
CS
FD 100 LT 150 FD 100 RT 120
FD 100 LT 150 FD 100
PU LT 90 FD 100 LT 90 PD