2. If your opponent is launching a lot of grenades, don't try to stand and fight. Give space and then counter when his ammo runs low.

3. Grenades turn buildings into deathtraps. Keep on the move and don't "dig in" to normal buildings - they are too flimsy to protect you. Blue buildings are pretty safe as long as you can keep the Grenadiers from getting too close to them - if a Grenadier runs right up to the outside of one, GET OUT QUICKLY!

4. I always attack Grenadiers first, since I consider them the most dangerous unit in the game.

5. Grenadier's greatest weakness is their short range and inability to act on their own. They don't have a (usable) OpFire command so they can't react to the enemy. The easiest way to shut them down is to blind them. If you can't get in range to kill the Grenadiers, concentrate on killing the units that are spotting for them. I've lost a lot of games simply because I lost three or four spotters and couldn't keep track of the enemy anymore. A blind Grenadier is a dead Grenadier.

6. There is a dead time during the turn between 4 and 6.5 seconds when it is impossible for a grenade to go off. Use that window however you see fit. (It's a great time to launch grenades, BTW. )

7. When fighting Grenadiers, time is on your side. They are more dangerous at the start of the game when they have lots of ammo. Draw them to your side of the map. That does a few things:

7.1. It keeps you from walking into ambushes.

7.2. It makes your opponent waste ammo at the beginning of the game.

7.3. It makes him use less Grenades mid-game because...

7.4. It's going to take him longer to reload.

8. Sneaking a couple of guys down near the enemy HQ mid-game can net you some easy Grenadier kills as they head back to reload.

9. Make a big show of assaulting in in one direction and then retreat the next turn. Watch the grenades harmlessly level the place where you were the turn before. Rinse and repeat.

10. Everytime you see a grenade go off, try to figure out where it was launched from. After a while you'll get pretty good at finding the Grenadiers and that's half the battle.

11. Be patient. It's better to dance around and probe than to walk into something.

2. Blow off the front of all buildings. That makes them useless to the enemy and very useful to you.

3. I used to assign my Snipers and Commanders to terraforming duty right at the start of the game, then reload them and send them out to battle after the first few turns. They main duties were:

3.1. Cut escape routes and access points on my defensive positions. Then I could move quickly and easily from room to room. Makes it great for avoiding grenades and moving around undetected. Let the enemy waste time covering the doorways I never use...

3.2. Setting up nasty traps where you take down the front wall of a building without your opponent knowing it. Can't tell you how many guys I've killed while they "Snuck" through buildings while being totally exposed to my Snipers.

3.3. Cutting doorways in building for my advancing troops to use. Many maps have great places to enter buildings undetected if you just put a hole in the right place.

4. When using my Snipers, I prefer to set up fire lanes diagonally across my front line. That way you get a number of benefits:

4.1. Usually the fire lanes are longer and they are not so obvious to your opponents.

4.2. You won't have many Sniper duels that way, since most people put Snipers in "obvious" positions.

4.3. You can cover your front line troops from rushes.

4.4. You get a better angle on "dodging" units since they assume the Snipers will be firing from the front and they dodge side to side.

4.5. Your Snipers are almost never in danger (!). Since your front line troops are closer to the enemy than you Snipers, the only what your Snipers can be targeted is if you leave them exposed at the end of the turn. Otherwise your front line troops will soak up all the OpFires.

5.1. spot with three or four Grunts and have my Snipers moving around the backfield trying to expose units. My goal is to never let my opponent see any of my units except my Spotters until it's too late.

6. If I leave a Spotter exposed at the end of a turn, I almost always keep him hidden for the entire next turn. The reason? My opponent will plot a ton of direct fires on him trying to nail him. Most players will not alternate them with OpFires properly so they usually won't react properlly when your unspotted units expose themselves.

7. Shut down your opponent's ranged weapons:

7.1. Learn to Corner Dance. One Corner dancing Grunt will shut down any Commanders or Snipers OpFiring at him.

7.2. Run on Grunt at full speed across your front. As he draws fire, the units behind him can step out and fire in safety.

7.3. When an opponent is advancing, stepping out quickly will trigger his HaltOnSighting and make him stand there for the rest of the turn like a dummy. Flash him whenever you think he's using HOS. Then grenade him.

7.4. Have a Grenadier expose himself for 1.9 seconds and then dissappear. This drives Snipers and Commanders crazy.

8. Try to sneak one Grenade Element forward and hide them. You should always look for opportunities to do this, since one hidden Grenadier can really do a lot of damage in one turn.

9. Space your Grenade Elements so that

9.1. The Grenadier can hit his Spotter and

9.2. Each Element can hit it's neighboring Element.

This gets you spread out properly and all your units can cover each other. When one Element is rushed, the neighboring Elements can bombard it's position while it retreats. Same thing happens if your Spotter is rushed, the Grenadier fires while he retreats.

10. I usually take two Medics. If I take one, I have to hide him since he's too valuable to be a fighting unit. When I take two, I can fight with both of them until one of them dies, and then I hide the other. So by taking two, I have more firepower at the start of the game.

11. Empty Grenadiers look like full Grenadiers. They make great bait. If you have an empty Grenadier and there's not enough time to reload him, use him as a spotter who attracts a lot of attention.

12. Use grenades to drop walls that your Snipers are aiming at to attack hidden troops.

13. Hunt Grenadiers first. If you can't find them, try to blind them by taking out the Spotters.

14. Having a Sniper or Commander's bolt fly past the corner of a building (or a window) at 9.9 seconds is a great way to nail those Spotters who step out at the end of the turn.

15. Do only ONE or TWO things per turn, and focus all your units on accomplishing them. For example, if you want to take out a Sniper, have all your Snipers and Commanders lob ammo at his position while your Grunts act as decoys. Use direct fires and time youyr shots so that there is a constant stream of death flying through his position.

16. Don't use your grenades up evenly. Empty a couple of Grenadiers and send them back for reloads while the fresh ones press forward.

17. Set up blow-through attacks whenever possible. They take the enemy by surprise and you can usually fire while staying completely hidden. Two Grenadiers can blow through three walls in one turn.

18. Stay on the move! Once your opponent knows where you are, get out quickly. Assume that anytime you launch a grenade, you opponent will be able to figure out where your Grenadier is located. I like to hit with one Element, then retreat them on the next turn and attack with an unexposed Element. Alternating like that will keep your opponent off balance.

19. Overwelm defenses by having all your units step out and fire at the same time. A good time to do this is during the "magic window" between 4.0 and 6.5 seconds when its impossible for grenades to go off.

20. Don't neglect terraforming. Use the terrain to your advantage, and if you don't like it the way it is, change it. Clear fire lanes for Snipers and wreck the enemy's defensive positions whenever possible. Cut access paths in your defensive positions. Make escape hatches in buildings. (Yes I mentioned this twice, but that's because most players never even think of doing this stuff, and it's very important.)

2. When tunneling, they keep my Commander alive if he tunnels into the wrong room (I usually follow them closely with a Grenade Element, so I have a ton of firepower available if they run into trouble).

3. But unless I'm tunneling, I won't make any ComMedics until 2/3rds of the enemy is destroyed. Why? Because hanging around a Commander is a great way for a Medic to get killed and the Medic is much more valuable as a set of eyes somewhere else on the map. If my Commander constantly needs to be healed, then I'm doing something wrong. I'd rather keep my Commander hauling his bigass gun around all over the map terrorizing troops than digging in and fighting. Remember, he's just filler - the grenades do the killing.

4. SPREAD THE HECK OUT!!!! If a grenade can kill more than two of your guys at once you are STUPID!!! Seriously, the biggest problem noobies have in M vs M games is bunching up too much. They also tend to do it mostly when hiding in or behind buildings, which is the dumbest place to bunch up. Can you say "Blow-Through Attack"? Can you say "Rats! I'll get you back next game."?

5. Marines have two big strengths - manuverability and focused firepower. I don't wear my opponent down. I prefer to carefully spot and set up an attack then hit him with everything at once and disperse my troops to avoid his counter. Find where the enemy is, drop his cover and dump a lot of ammo through the hole. Grenades and lasers complement each other in this - one drops the cover and the other one gets the kill.