LEVEL 01 TO 10 WARP
When you get the flashing section of wall at the end of the 1st
level, turn 180 degrees and fire at the wall. The wall will
disappear revealing a clue item that will warn you that you are
nearing the warp. Move forward and shoot the next wall to reveal
another flashing wall. Walk into it to warp to level 10!
LEVEL 10 TO 20 WARP
As soon as you see the Level 10 exit, turn around 180 degrees
and fire at the wall. A new exit will open up that takes you
straight to Level 20!