Machine Soldier can special summon Machina Fortress, as it is a Machina monster. Machina Fortress has an inbuilt special summon method, but this is a 'you can' and not a 'can only' thing, it can be special summoned by other effects if you wish.
Since Machina Soldier is a machine, you are also allowed to use it to pay towards Machina Fortress's own special summon cost.
If the summoning conditions it can be Monster Reborned from the Grave Yard.
No, only the player who activated Flute of Summoning Dragon can special summon the dragons through its effect.
Not unless the special summoning effect specifically says you can, like The Shallow Grave does.
As long as you are Special Summoning before, or during the Battle Phase, then yes, that monster can attack.
While Toon Blue-Eyes is a special summon only monster, is it different in that it has no specific summoning method, ie, you 'can' use the one on the card, but that's not a 'can only' like, say, Chaos Sorcerer. So Toon monsters like Blue-Eyes Toon Dragon can be special summoned with cards like Monster Reborn and Flute of Summoning Dragon, but only if Toon World is active.
Yes, Machina Fortress can be discarded as part of the cost for its own effect, and then that same Machina Fortress can be special summoned from the graveyard.
If it is originally in your hand, then yes, you may send the Machina Fortress in hand as well as one other monster, and then special summon that same Machina Fortress from the graveyard.
Neither, Machine Fortress' special summon effect is not one that activates.
If the summoning conditions it can be Monster Reborned from the Grave Yard.
No, it does not. It the attck is negated, it is like the attack never happened and the effect can not take place.
A Ritual Summon is a kind of Special Summon. Anything that affects a Special Summon (such as "Bottomless Trap Hole", "Royal Oppression", etc.) will affect a Ritual Summon.
his weaknesses are death and summoning the devil
No, Jinzo is not listed as a Fusion Material monster for any Fusion Monsters.However, it can be used as a Fusion Material monster in the Fusion Summoning of Chimeratech Overdragon and to Special Summon Chimeratech Fortress Dragon.
No, only the player who activated Flute of Summoning Dragon can special summon the dragons through its effect.
Summoning scrolls are used to invoke special moves of familiars within the Summoning skill. These scrolls are created by using Summoning pouches on a Summoning obelisk. Each pouch will transform into 10 scrolls. When a special move is used, the "Special moves" points will be reduced a certain number (see below) and the player will receive additional summoning XP (XP is only gained for manually activating a scroll in the player's inventory and not for scrolls activated by enchanted headgear).
Not unless the special summoning effect specifically says you can, like The Shallow Grave does.
No part of Winged Dragon of Ra's effect stops you from Special Summoning while you have him out on the field.