Special keys

These are really special items
try them

Type these
Space: Turn screen like space (Bejewelled is starfield)
Void: Turn the screen white
Zombie: Turn all your virtual tank fish to look as if it dies but acctually it is alive.
Trigger these in the virtual tank.

This is sandbox mode
press these keys
Up,up,down,down,left,right,left,right,b,a

Note: you need silver trophy to do it.
Trigger sandbox mode through the main page

What is the silver trophy?