Are you sure you're playing AlphaDawg's Unofficial Third Quest, or is it a different game?

If you're playing AlphaDawg's Unofficial Third Quest, I do not understand how you got to Level 4 and found the Blue Ring without finding Level 3 first. If I understand this quest properly, the Blue Ring is available in a secret shop, but you have to pay 300 rupees to get it, which means you have to have a wallet which is in Level 3. Also, the Whistle is supposed to be in Level 3, and you need that to open Level 4.

Don't worry about trying to PM the author as he is probably not active on the ZC forums anymore.