Stuck in Infestation 1.1--can't get all the keys

There's a 2nd purple key, and no blue key.  Is there any way I can just cheat for it?

Cheating such things is very easy by editing the save game, but I remember cheating wasn't needed to beat the level.

Did you play 1.1, or the unnumbered version?  I've been trying the Palaces in different order, and there's a purple key in both the Forest Palace and Air Palace.  Picking up either one despawns the other.

I have purple key in forest palace, but I can't find the air palace. Could you post coordinates of the screen?

Never mind--there are two purple keys, but the blue key was in a place I had forgotten to check.

The air palace is over the top of the waterfall.