Danger! Dark world

This deck is supposed to extra-link by using firewall to spam dark world monsters from you hand.

First of all you shoul special summon at least one monster, which could be a danger! or Beiige/Goldd. Then you can normal PSB to create 2 tokens and special summon Firewall. You should have Grapha in your graveyard, maybe using trade-in, or you can discard it thanks to the effect of Portals. Try to special summon 2 more monsters (at least 1 dark world): now you can make a link 2 and thanks to firewall you can special summon 1 monster from your hand, which will be a dark world: now activate grapha's effect and special summon it by returning a dark world to your hand. Now you can special summon a link 3 (grapha + link 2), maybe Unicorn or tri-gate magician and special summon a dark world from your hand (the same which has returned to your hand in order to special summon Grapha).

Now you should have Firewall + link 3 + Grapha on your field: at this point you can activate firewall's effect to bring a danger! back to your hand and activate its effect. You should have at least 2 cards in your hand (a danger and a dark world, which is supposed to be Beiige or Goldd): if your opponent chooses the danger, you will discard it and activate its effect (if Chupacabra you can summon a danger from GY) and if he chooses the dark world you can special the danger, special Beiige/Goldd and draw 1 card, then you can make a link 2/3 using Grapha and other monsters and, if the carded you've just drawn was a monster, you can special summon it thanks to firewall.