This is was a pretty cool level. I've recently ran through it again so my advice could actually be worth something. Approach each of the tunnels in the block room with caution (ie. draw your guns). There's really only one important area behind a block. Don't leave the water room without a key. It's in one of those cubby areas. Once you use the key, don't go through the door that just opened. Get up to the door that opened in your electronic mind's eye. There's a switch up there to lower the first drawbridge. Then you can come back down. Time to do some serious climbing. You don't have to go down into the dark sliding area half way up, but you paid for an adventure game, right? Once you're up at the top, finding the second drawbridge switch is a simple matter. Look around for a nice hole to fall into. Once you're at the bottom, look around for a switch but careful with those back areas. Wow, that slide turned into stairs. There's a nifty opening under the stairs. You'll find another switch out there, but it's not a drawbridge switch. It's one of those magical switches that turns slides into stairs. From the top of the stairs, a little jumping and hand over hand action will get you to the last slide-to-stair switch. If you want to be really sneaky, you can jump up out of the opening and fire at the mummy. There's two switches up there. Three down, one to go. Head to that doorway near the second slide-to-stairs switch. You don't have to go down to the floor. You do have to shimmy along three different ledges. If you decide to head down to the floor, have your weapons handy. The last switch is in there. Time time pick up the items around the obelisk. Make sure you have all four items before you go swimming. You cannot get all of the items in the side caverns and still make it out. Don't try to do both in one swim. That mummy is nasty, but he can only be on one side of the pool at a time. Wow, remember this place? You know what to do. Actually, you really thought you were going to have to do it on the City of Khamoon level.