Find all nine life upgrades before beating the game.
You get only one shot at this: In the Mystic Caves when you pass the first locked gate you'll come to a pit with a switch. There's a piece of wall you can break down there with the scorpion sword. Break the wall, break the weapon rack and get the sword.
You must get this before you find The Mask. Near the top of the present-day Mechanical Pit there's a room with a fireplace. A passageway leads out that ends in a watery pit. Head down there, use the scorpion sword to break the wall in the water pit, and then break the weapons rack to get the bear.
You get only one shot at this: After the prince's little "depression" you have to run from the Dahaka 3 times. The 2nd and 3rd time, each pathway split in 2 eventually. There are 2 paths, a right and left one. Next to the left one there is a weapons rack in front of a big gate. Break it and you will see a big, white glove. Be careful, if you don't do this quickly enough you will probably get sucked in by the Dahaka.
You must get this before you find The Mask. Go to the Hanging Garden in the present. It is behind a wall in the first alcove you come to, heading towards the huge ladder in the past.
Go to the Central Hall in the past and move the switch towards the Hourglass Room. Take that new path and get to the breakable wall at the room's end.
Special thanks to Revolution readers Dhalsim, Peetey, and Zachary Peterson!