Traps

Traps are featured in plenty of maps in Call of Duty WaW and Black Ops 1.
Traps usually sell for 1000 points and will kill any zombies that fall into it. You can lead your train right into a trap, then activate, and watch all of your zombies die. There are traps on at least half of the maps on Black Ops 1 and 3 of the maps on WaW. There are also traps on Black Ops 2. I would recommend waiting to use these though until later rounds as they suck points away and when the zombies get very hard to kill.
When using traps to get to a high round...

• Gather up your zombies in a train like I taught you.
• Lead them over to the trap.
• Activate and watch them die.
• Shoot the zombies that spawn back in your train to get your points back.
• Rinse and repeat.

Next post will be about boss zombies and boss rounds.