I have managed to beat the 2nd extra boss... gives you the final key item. And, it's repeatable!
Thanks for the Pyramid one.
Help me with the rest of the collection. One is at the Moon Tower's pool, another is at that desert tower's left side, in the candle, but I need number with location; #1 is top-left, #2 is top-right, and it zig-zags from there.
For ITEM collection, remember that some enemies also have equipment drops, but are uber-rare. Zombies in the first cave have a rare drop of such sort, for example. If you feel confident, speed things up with Meat Scents, to get it "sooner".
182 treasures exist in the game: chests and the blinking spots. For completion, wait until you have beat the game (for Crimson Key), and some Cat and Dog items (treasure sniffer and easier location). Again, NOT ALL ITEMS are found this way, as mentioned above.
THE FINAL KEY ITEM IS JUST FOR BRAGGING RIGHTS. Just saying.