To receive this minikit, you must kill three spiders hidden on the stage. First of them can be found near to the starting location, on the left to the cameras.
Second is hidden on the floor above, in the dark corner of the room.
Third can be found on the right side of the entrance to the building.
Jump between two blue-and-white walls to climb on the ramp. Then use Magneto to rotate huge metal vent.
Head to the exit and look left - you will see small pool of water. Freeze it using Iceman and then melt an ice block (that you have just created) with Human Torch.
To obtain this minikit, you must melt five golden altars of Hydra, located in the interior of the building. First of them is standing in front from you, on the left side.
Second can be found on the right, face to face with golden wall, at the farthest platform.
Third is located on the right from the golden wall, on the upper floor.
Fourth is hidden right under the ceiling, on the left side of the room (near to the machine, in which Stan Lee was imprisoned).
The last altar is located on the right, at the podium near to the deadly laser machine.
Choose a character with electric powers and approach to the battery located near to the huge cogwheel. Charge mechanism with electricity and pick up a minikit, which is sticked to the device.
Go to the one of the infernal machines (choose this one, which require Hawkeye attention) and fly down to the lower floor. Enter the room on the right and then extinguish all fires.
In the new area head right, reaching to the two attaching point. Yank them with a web (you can use Spider-Man or Venom) to unlock next minikit.
In the same location fly to the platform located above the entrance to the arena. Choose Wolverine and destroy all obstacles in the area, uncovering claw switch. Use it and you will receive new minikit.
During final fight head right, go to the upper floor. After that, just use Mr. Fantastic to pass through the bars.
To receive last minikit you must destroy all four pennants located in the corners of the arena.