The hardest part of Pengo is getting all three magic blocks together to get the extra bonus.
How I play the game to later levels (never could when I was younger) now is to rid myself of the Snowbees when they are incubating in the blocks. Just crush those near as quick as you can, then line up defenses where you can send the ice block speeding down the line to squish the snowbees.
Also don't sit in the corners, its ok to do that if there is one or two left as you can use the walls to disable them other wise they will gang up and trap you. Also give yourself exits so you can avoid the traps.
As the levels progress repeat the above but at a different location of the screen and alternate them hopefully you will get the screen where the magic blocks are close so you can scoop some snowbees up for additional points.
I have never seen any books on Pengo and I'm sure the different versions out there like the different types of music signify a slight change in gameplay. I have played both versions and have yielded the same scores, and die at the same level as the game progresses like Dig Dug..faster and faster.

I love Pengo its a great game, up there with Pac Man and Dig Dug.
