PENGI

On the first screen, you 
must kill two yetis, 

in the second, four, and in
the third six, and so on. 

To kill a yeti, you must use
the space bar to push a 
block of ice at him. 
 
This isn't as simple as it 
sounds, because each block 
of ice must travel over at 
least one space before 
hitting a yeti. 

If an ice block is pushed 
into another ice block
before moving over any
spaces, it will shatter. 

Things get really tough when
the screen becomes very 
yeti-infested. Every time a 
yeti moves into a block of
ice, the ice vanishes, and
the more yetis, the less ice