Hint - Berserker Beat Down (Then Beat Yourself Down)
To defeat the Beserker at the end of act one, simply dive to the side when she charges at you. Run through the doorway to your right and continue to the door at the end of the room and face your back to it. Get the Berserkers attention by shooting at her or revving the chainsaw then, dive away at the last moment when she charges causing her to break the door down for you.

Continue this to get through the next two doors. When you finally lure her into the courtyard simply use the Hammer of Dawn twice to take her down. [If Dom is killed the mission is over, so revive him if he's knocked down]

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Hint : Quick Reload
When reloading your weapon, watch the upper-right corner of the screen for a meter that counts down. Press the reload button a second time when the meter's moving bar matches up with the stationary bar. This will give you a super fast reload and put you back in the fight quicker than normal. However, if you mis-time the second button press your reload will take longer than normal.
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Hint: Avoiding the Kryll
In the second chapter of the game, you'll be swarmed by enemy kryll if you so much as set foot in the dark. To avoid being attacked, stay in the light at all times. When there's no light in sight, look for propane canisters you can blow up to create some flames that'll scare off the kryll.
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Hint: Regain Health
Unlike most games, you can regain all of your health in Gears of War without the need for health packs. Simple stay in cover for a few seconds and watch as the bright-red gear in the center of the screen fades away. When the gear has comlpetely disappears, your health will be completely full.
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Hint: Fighting the Wretches
When fighting wretches--the small, shrieking enemies that don't use weapons--attack with melee strikes. The best melee strikes come from weapons other than your grenades and Lancer chainsaw rifle. The chainsaw attack is too slow to combat the swarming wretches, so stick to quick-hit melee punches for instant kills.
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Hint: Finding Cog Tags
There are thirty hidden Cog Tags scattered throughout the game. They're small and sometimes hard to find, but there's a a mark you can look out for that'll make finding the Cog Tags easier. Look for large, red Gear logos pasted on the walls--if you find a room with this large Gear logo, examine the room and you're sure to find a Cog Tag somewhere.