to get though the first puzzle you must

have the effects of Sugar Rush, Wussiness, and Rainy Soul Miasma.

Get either Tasty Fun Good Rice Candy (from the Valley beyond the Orc Chasm) or Angry Farmer Candy (from the Giant Castle) to provide a sugar rush, a Wussiness Potion (from the Gate of the Deep Fat Friars) to make you weak, and a thin black candle (from the Giant Castle) to make you depressed. Use all three at once, and then make your way through the doors

then
the next one is even easier all you need to do is Unequip all your items, then proceed.