Yeah, I hid some cool stuff in this stage, so think of this as the spoiler filled guide.

Hidden 1-Ups (E-Tanks)

There are 15 hidden 1-Ups (E-Tanks) in the game. I'll try to describe how to obtain them here in the best order in which to get them.

1. Just above Samus's ship in the cockpit.

2. Behind the Chozo statue.

3. Above and to the right of the warp pipe spewing Red Koopa Troopas.

4. Down the long path and against the wall that the kicked Red Koopa Troopa's shell must bounce against to return to hit the Question Mark Block.

5. In Kraid's lair under the platform on the right.

6. To the left of the first elevator drop in the game, must jump out of the Kuribo’s Shoe to reach.

7. In the upper right section just before the long spike path that requires the Kuribo’s Shoe.

8. To the left of the second elevator drop. Travel across the top to not be fooled.

9. At the entrance of the blocked off room (The Armory) to the right of the second elevator drop.

10. In the Armory in plain view.

11. In the Armory near the end in plain view.

12. At the end of the Armory in a block.

13. In the area to the left of the vine in the conveyor belt room.

14. In the upper right hand corner of the Metroid hallway.

15. During the invincible Speed Boost part of the escape there is an area you can jump to almost halfway down the conveyor belts. It's next to the coin.

Getting into the Armory

The Armory, the blocked off room to the right of the second elevator drop, is the hardest standard room to get into during the adventure. It's not required, but holds four 1-Ups (E-Tanks) as a reward.

To get in, go through the door to the left of the second elevator drop. Find a hidden P-Block in that room with the door. Activate it and run back to the armory before the P-Block's timer runs out. You only have one shot at this per run.

Tip: There is a hidden block to the left of the door in the P-Block room. Hit it to make slipping through the crack harder.

It's possible to run across the top of the ceiling to hit the P-Switch after finding a hidden block to the left, but requires quick and precise platforming. An alternate method is to lure the low flying Bullet Bill in the room to the left back over with you. From there, bounce off it and land directly on the P-Switch and then run across the top to the door. It may also be possible to jump out of the Kuribo’s Shoe to hit the switch, if you can get it there...

Save the Animals

You will encounter helpful wildlife during the adventure. Elections (Goombas) and a Dachora (Green Koopa Troopa) show Samus what to do. It's possible to save them at the end of the game.

After the second set of cannons you will encounter, right before the Flag Pole, drop down into a little crevasse. There will be a P-Switch there. Hit it and quickly fly your stolen Space Pirate craft to the upper right most area of the map. If you are fast enough the animals will land next to your escape vessel next to the flagpole.

Keeping the Kuribo Shoe After the Spike Section

Most players will abandon the Kuribo’s Shoe in order to get to the Warp Pipe after the spike section that requires it. However, there is a way to keep it!

Bring the Kuribo’s Shoe back to the Chozo statue and stand or jump off its head. You will notice a Bill Blaster oddly near the top of the screen. Wait for it to shoot a Bullet Bill and slowly follow it all the way back to the Warp Pipe. From there, while still in the Kuribo’s Shoe, jump off the Bullet Bill to get into the Warp Pipe with it!

Zero Suit Samus Ending

If you manage to make it to the end of the adventure with the Kuribo’s Shoe you can earn yourself a Zero Suit Samus ending. To the left of the flagpole is an area that requires Samus to jump out of the Kuribo’s Shoe in order to reach a Question Block. Hit that block to get the Zero Suit and earn the good ending a pro player like you deserves.

Hidden World & Major Sequence Break

Like the NES Metroid, it's possible to find a Hidden World and to sequence break the game. The trick to this is to use some of the other secrets on this page in conjunction with one another.

To access the Hidden World, bring the Kuribo’s Shoe into the Armory. Then go as far right as possible. While standing on top of the block containing the last 1-Up in the Armory, jump with the Kuribo’s Shoe, then jump out of it while holding right. Samus will find a Hidden World full of small platforms. Follow them and defeat “Mother Brain” a special way. Using this method you will skip the Ridley fight, but you won't be able to get the Zero Suit Samus ending.