The Volcano Replika is a Virtual World from the game Code Lyoko: Quest For Infinity.
This Replika is said to be XANA's heart.
This virtual world can be reached through the Network using the Skidbladnir.
This virtual world seems to contain dozens of Towers. However, only five of them can actually be entered and deactivated.
The goal is to deactivate all five of these towers in a row without being devirtualized. You will be granted an advancement if you succeed.
All of the towers are permanently activated by XANA. This means that they will automatically be reactivated after a deactivation. This does not reset your advancement progress, so you can leave them be after deactivating them once already.
To reach the towers, a lot of parkour will be required. This is where the biggest challenge of the Volcano lies, along with its Monsters. It is also possible to skip it using Overvehicles, but where's the fun in that?
Volcano towers only grant 20 Energy instead of Lyoko's usual 100.