YMMV / Genewars

• Game-Breaker: This game is much easier when you figure out exactly where the computer first lands on the map and run over there to destroy them right as the game begins. You can even manage to destroy all three enemy factions in the final level who land one after another before they can ever manage to produce a creature. Though you still have to deal with the half dozen creatures they get to start with.
• That One Level: Several, but one that stands out is one where you start out with a base that has all of its buildings disabled, including what is probably your first Stun Turret. Unless you are lucky, it is very difficult to deal with the hordes of Dinos and Dinocrabs the enemy will send at you. You can either try to manage to break through that endless stream with the computer's infinate goop, or break into their base with two or more engineers and detonate their gene pod. The etherals don't come until you build an observator that level, so you don't even need to worry about that. You can kite the dinos into the winter land and freeze them to death, but its very time consuming to get a base going out there and once you do the land around your base is safe from the cold so the enemy can often manage to get a dino or two in there to destroy your buildings.