It says 2+ monsters, so I had 2 monsters on field but I could not summon it, I mean do I need 2 link monsters to summon it? 2 normal monsters , 2 effect monsters?
Firewall dragon is a LINK-4 monster so you need 4 non link monsters.
Or if you had link monsters on your board alreasy it'd need 2 monsters minimum (that's what the 2+ means) whose added link ratio is 4 (link-2+link-2 or link-3+link-1, etc)
Limit Code can summon a link3 Monster, you only need a link Monster in your GY, and another Monster to summon Firewall...
Or use a Cyberse deck, ive made link4 or even more un muy 1st turn... Im using the other UR link4 of the box, the machine, and I can summon It in my 1st turn, make It attack twice (using the UR link2 as material) and win...
plus a link monster you magically make appear in your gy + waiting a turn bcz it's a trap card yeah you just have to ask your opponent to let pull all that......
The link Monster can be the link1 Cyberse link that only needs a 4 or lower level Monster, but It was just an option, the best way is just using Cyberse Monsters,with the right combo, you can summon Firewall in the 1st turn, and another link Monster...
Dotscaper can count as 2 Monsters, as It summons itself from Graveyard, and It can be used for a link1 summon, but if you use Linkslayer effect to send Dotscaper ti the Graveyard, you can still normal summon and make even a link3 summon with the right cards...