Got stuck in a Digdogger room in Level 3 without the whistle, with no way to leave. Also never found a Map for this level.

Never found the Compass in Level 4.

In a fairyless lake, the whistle shows a staircase but there's no way to get across the water to get to it, even with the Ladder. I suspect this is where the white sword is, as I never found it before getting the Magic Sword.

Level 6 is still one big bug (you must reset upon entering), and Level 8 has a room with 5 'Deathnuts', which cost me my first life (I had no potion when I entered). I can try that Level again, but the issue I've experienced (with Level 6 and otherwise) render this quest currently unplayable.

Sorry.