Scrapyard Dog strategy

These are the only warps that I found in the game. There may be more.
EJ (Ed Saloka)

WARP to FOREST

To perform the warp, you must be on JUNKYARD Level 2. Move right through
the level to the stack of tires. Jump onto tires and press down. The can room
will appear. The following table show where the arrow starts and where the
prize ends up:

Start Finish
1 5
2 1
3 4
4 2
5 3

You are now small in size. This allows you to knock on the WARP door and warp.
As you move to the right, press up in front of the tree to get an extra life.
Keep moving to the right and avoid being hit by bullets, dogs, mice, and bird
dropings. Jump up where the hub caps are hanging on a line to get
invincibility. Also pressing down while on top of the third brown can (the
one to the left of the mouse caught between cans) will give you a shield. When
you get to the toilet just before the office, jump up on the toilet. Face left
and hold down. A red warp door will appear to the right of the office. Move
over to the door and hold up to open door and warp.


WARP to DESERT

To perform the warp, you must be on CITY Level 1. Move to the right until
you get to the black cat up in the window above the mail box. Throw a can to
get rid of the cat. Jump up to window where cat was and press up. You will
now be small. Move back to the left to door by mail box. Jump up steps to get
level with door. Hold up while in front of door to get red warp door to appear
above the door. Now quickly jump onto mail box, jump to the left edge of the
screen while holding the jump button (to achieve a higher jump). This will put
you at the red warp door. Press/hold up in front of door to warp. 

WARP to MOUNTAIN

When small, look in the base of the tree near the second white cat. The 
red door will appear at the top of the screen, on a cloud, almost out of sight.

WARP to ARTIC

You must be in the FOREST level 1. At the start of the level, move to the 
right to the log when the rabbit comes out. When you jump on the log over the 
hole where the rabbit came out, press down on the joypad. You are know small.
If you go to the right, you will encounter a tree with two snakes. Enter the
door to enter the shop. Exit the shop and the snakes are gone. Now jump on 
the stump to the right of the shop. Face left and hold down till the WARP door
appears on the branch. Jump up to the door and press up. You will now warp to
the ICE area.