This is a small level that can be completed in 5 minutes. I wanted to make a levelset but I don't have the data for the second level so I left it like that. Perhaps I'll make a TR2 type levelset soon...

WALKTHROUGH:

As soon as the level starts, jump and grab the bridge above. If you don't manage to do so, keep sliding and make sure you jump to the very middle of the slide so you can jump near the end of it and grab the sloped structure so you don't crush your bones in the deep hole. Either way, you must push a lever in one of the high walls, there's also a small medipack in this passage. The lever opens a door in the opposite wall. Carefully step on the piece of bridge and from there jump to the opening and fall down to the other passage where you'll find SECRET #1: a big medipack. Follow the passage and the doors will open at your approach. Get down to the lower level, avoiding the deep hole and kill the 2 wolves. There's a block in the snow containing 2 boxes of shotgun shells. Go to the opening with grass everywhere and climb up into a small maze. Go right, straight, left, straight, left and left again to find a small medipack. Go back the way you came. From the starting point, go all the way straight, then left and left again to find a lever. Pull it and the camera will show you a door somewhere opening. Get out of the maze and now head to the cave ahead with the pillars. 3 bats will appear so fill them with lead. Before entering the pool, pick up the uzi ammo in the alcove in front of you. Now get in the water and swim past the entrance. At your right there's a high opening, so swim there and through the narrow passage until coming to another guarded by two deadly swinging blades. Carefully make your way through them and you'll find SECRET #2: a small medipack and magnum ammo. Swim out of there and back to the area with the big pointy structure. The exit is in a corner above. Pull out of the water and enter a cave with a destroyed bridge and a deep chasm below. Climb the block and carefully step onto the pieces of bridge (they're a bit buggy for some unknown reason, like they have an invisible sloped part). Jump your way through them until getting to the other end of the bridge. SAVE YOUR GAME HERE. If you want the final secret, you'll have to be really quick. Start sliding down, jumping to the right side of the slide and avoiding the darts. Jump to the collpasing tile and keep running and jumping through the passage before the door closes. The SECRET #3 is a shotgun. Now go back to the slide and make sure you have full health. Slide on the right side of the ramp to avoid the set of swinging blades. You'll come to a tall room with a pool. Dispatch the 2 wolves and 2 bears you'll find here. Pick up the small and big medipacks lying together close to the snowy stairs. Go up those stairs all the way. At some point 2 bats will appear so kill those too. SAVE YOUR GAME AGAIN, as this sequence might be sort of tricky. Jump to the first collapsing tile, then to the second, and then the third at the corner. What I did here was to jump sideways to the right to the other 2 collapsing tiles, and when Lara is on the second one, run before it falls to land on the very last one below the opening, now from there quickly pull up into the alcove. Pull the switch that will open the two big doors underwater. Now from here you can swan dive to the pool and swim straight to the entrance to finish the level.