Today is L-4 Pitfall Plains. Unlike L-1 to L-3, you can get all items in just 1 run.
Main route is just run to the end without falling into the pits, but you need to find an onibi to unlock the door first.
Unique item:
It's Sickle. Consumable weapon that being thrown in a curve (like axe in castlevania). Cannot be used to hit switches.
After dropping from the hidden pit at the main route, go through there without dropping into the second hidden pit.
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100% items:
1. Ice spray is needed (that you can found it just after falling to the first hidden pit, hidden on your left hand side).
After dropping into the second hidden pit, keep going and break this block.
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Keep going and enter the door to solve the puzzle. That rewards a power up chest.
You can also get an onibi above the puzzle room.
2. Same as the place above where to break the block. This time go to the upper route. Break this block and enter the hidden room, to get a MP up.
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Keep going up and you should find a switch. Hit it and go back to the beginning. The switch will also close the hidden pit, but we have no use on it anymore.
Jump onto this platform and keep going, to get another onibi to transform.
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3. Use phase shift to pass through the thorn that next to the switch. Keep going to get the Emblem Piece 1.
As a reminder, phase shift can also let you jump higher and longer.
4. Ice spray is needed.
Drop down from here.
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Keep going and use ice spray to hit the hidden platform. Break this block to get a HP power up.
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5. Keep going left after falling form the ice hidden platform (or just fall from the holes at the beginning), use phase shift to pass through the thorns. keep going to get the Forest Entrence Key.
It's the key to open L-5.
...How to beat the boss in sewer in order to go to L-4?
I dunno. I just use CE to lock my HP.
I just know you can bat the ghost to hit the boss. If the boss is using bite, it will eat the ghost and cause huge dmg.