To everyone who wants to tame a Giga and wants to use a Trap. The best one is the one where you use 14 Meta Pillars.(I can speak of experience it Always works) Of course you can use the Metal Gate Trap as well. But for the one with the Metal Pillars you need less Ressources and it is easier and faster to build. Also remember that the floor must be quite flat for this trap, otherwise the Giga can run over the metal pillars.If you keep this in mind, it is easy to tame a giga. If you need help building the trap, you should watch the Giga Trap video by Captain Fatdog. It helped me a lot.

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