If find an arcade cabinet of Pengo (which is going to be kind of tough these days), you might be tempted to play it. And once you do, you're going to notice that in the middle of the playfield are these blocks with diamonds on them

They've got a couple of interesting features: they're indestructible and if you line up all three of them so that they're touching...

The screen freaks out and you get 10,000 points! As an added bonus, all the Sno-Bees in the level are stunned, for a few seconds

Giving you a pretty sweet advantage (even if it is temporary).

The only problem is that in some levels the blocks are placed in such a way that it's virtually impossible to get them lined up, so if that happens, I wouldn't worry about it too much.

You have two ways to clear levels in Pengo, you can either make all three of the blocks with diamonds on them touch each other or you can use the regular blocks to squish the blob-things that fill up the levels.

But, what might not be immediately obvious is that you can use the boundaries of the stage to your advantage.

Just walk up to the edge and press the Push button. You'll cause shockwaves to go down the length of it, stunning any enemies that are near it.

Giving you a few precious seconds to formulate a counter-strategy.