C3Dwalkthrough

Desert / Depot Run: A couple of pre-programmed attacks. A lot of snipers. Roll-left and roll-right will save the day.
Desert / Spy Hunt: Lots of medical packs are around. So getting through should be fairly easy. The initial outpost that has a lot of machine gun nests can be cleaned up with the plentiful grenades you get. The snipers can be picked off with roll-left and roll-right and grenades.
Desert / Drive By Rescue: Clear out the entire area of tan. Then take the mine-sweeper that you get and clear the minefield. Who put signs on a minefield anyway? Bring the jeep up next to the barbed wire fence (that you can remove by shooting the drum next to it.) The barbed wire area is in the very heavily defended area. It's tough to describe where it is since all of the terrain looks the same. It's close to the minefield. After you get the jeep up near the barbed wire, get out of the Jeep and get the guys. Then drive the jeep to the Helicopter located up on the hill.
Desert / Comm Down: The first enemy tanks you see! There are two. The first is a fairly easy kill with grenades from behind the mound that is between the crates and the trench. The second is a little more difficult. There is an area that you can use with some safety to lob grenades onto the tank. It's not that easy, however. It may be worth doing a tank-on-tank battle here. You will have an even chance because you will have a completely untouched tank because you destroyed the first tank with grenades. The rest is mainly snipers, nests and grenade guys. The usual strategies apply. The target is remarkably well defended. Explosives take down the tower.
Desert / The Key: Despite the Sarge's pessimistic attitude this is actually a pretty easy level. The stuff at the top of the pyramids are simply covered machine gun nests that can be taken out with a single shot. First thing to do is take out everything at the front of the main pyramid. Then move inside to the front of the ramp and kill everything you can get to on the right, left and center from there. Then go outside of the pyramid and go to the right. Following as for as you can in every direction. You will get a lot of mortars. You will get all the way around the back of the pyramid. Plus you will get lots of opportunities to pick off guys at long distances. Most importantly is the last mortar that you get around the back. With that mortar you can knock out the power generator which is half of the mission. It is in the very un-pyramid looking section to the right of the pyramid (from the back). It is at the absolute limits of the range of the mortar. Blow it up and you will save yourself a lot of trouble. Now return to the front of the pyramid and clean out everything on the hill to the right. More mortars, more health, and more opportunity for sniping (with Rifle and mortar). Now that you have cleaned that out you can go up the pyramid. Start on the right hand side and watch out for guys popping up out of nowhere. Make your way to the top and use a mortar to shell the guys inside. Get the first key. Now use the mortars to shell the tanks that come out. Viola!
Desert / Dry Gulch: This is actually a pretty simple level. If you wait long enough the tank will leave the company of the bridge and leave it wide open for explosives.
Alpine / Downed Chopper: Three ways to make this level a whole lot easier. 1) Use the barrels located next to each of the tents to blow up the tents before all of the tan soldiers wake up and start pounding on you. To use the barrels to blow up the tents, shoot them. 2) When you are clearing out the minefield, clear out the section next to the big rock right where the guys are located. It's not posted as a minefield, but it has mines, and one of the troops is pre-programmed to walk right into it. 3) Lead the guys out to a safe distance out of the minefield and have them defend. Then go clear out the area around the chopper pad yourself. Then go back and get the guys and take them to the Helicopter.
Alpine / Lumber Strike: Once you have survived the initial pre-programmed strike on the first island you need to start cleaning out the front emplacements of the camp. Then moving from left to right clean out the emplacements right inside the front gate of the encampment. Then move into the middle of the road and pick off the guys in the center. Then go back to the right and pick off the machine gun at the edge of the wood pile. Now move in closer and draw the bazooka fire. Using roll left and right, kill the bazooka guy. Now proceed to the left. Kill the machine gun nest and the rifle guy in back of him. Get the explosives out and set the next to the Helicopter. Retreat and wait for the explosives to go off. Then you are done.
Alpine / Mining Camp: This is another cleanup operation. There is one pesky flame-thrower guy pre-programmed to come out of the mine car area. You will want to kill him as quickly as possible.
Alpine / Race to the lake: Initially there is a bazooka guy located right ahead of you. You can avoid him simply by standing a little behind the rock and firing at him. The rest is a standard mop-up.
Alpine / Tan Express: The biggest threat on this level are the four machine guns right ahead of you from the beginning. You can go to the hill on the right early and pick them off. The one on the far right will need to be avoided with rolling maneuvers.
Alpine / Train Station: The best way to get through this level quickly is to head immediately to your left and over the train tracks as soon as possible. Of course, after getting through all of the pre- programmed attacks. Make sure to bring enough grenades and/or bazooka rounds to kills at one tank. After you get over the train tracks proceed to the right and then head in towards the left when the rock divides the way. There will be two machine guns and a sniper there. Take them out. Then destroy the tank. If you use grenades he will not attack you. If you have a bazooka out he will turn around and fire. Either way, he is an easy kill. Then proceed into the fenced in area to get the key. It will take a little while for the shock to set it, but the program will eventually offer you the option of Saving and moving on to the next level.
Alpine / Prison Break: This level is divided into four sections. The first is the machine gun (and sniper) nest. The second is the tank. The third is the prison (and surrounding area). The fourth is chopper (and surrounding area.) You can run right around the first two sections (the machine guns and tank). Avoid them entirely. Now clean out the whole third area. Blow the building. Now have the hostages go into defend mode and go clean out the fourth area. Now have the hostages follow you out to the chopper.