The phrase "as an extra level" is correct and usable in written English.
It can be used when referring to an additional layer or degree of something, often in contexts like gaming, security, or complexity.
Example: "The new software update includes a feature that allows users to unlock challenges as an extra level of difficulty."
Alternatives: "as an additional layer" or "as a supplementary level."
This provides as an extra level of security, because it contains the data used to randomise the candidate order on that particular ballot paper.
We need the Travel Ban as an extra level of safety!" By "our rights," Trump apparently meant the right that he presumed to have, as President, not to listen to the courts.
He must have known this would happen, but I wonder if it comes as an extra level of relief, or merely adds to the oddness of his indeterminate status: all the downsides of being a royal – the intrusion, the curtailment – with none of the power or glory.
We need the Travel Ban as an extra level of safety!" There was no expression of concern for the dead and injured and their families; no expression of admiration for the bravery of the British police, who were rushing into a deadly situation; no expression of solidarity with the British people and the British government.
As an extra level of protection, you can set an expiration date for your key.
We need the Travel Ban as an extra level of safety!
In conclusion, AS-PLA detects alpha-synuclein oligomeric pathology in neuroanatomical areas ahead of AS-IHC, providing an extra level of detail and resolution of alpha-synuclein pathology and potentially a new spatio-temporal window to detect and follow early pathological changes.
Articles on topics as sensitive as abortion need an extra level of diligence and scrutiny — "bulletproofing," in newsroom jargon.
The start of A4e's prison education contract was complicated by a delay of several months as the company underwent an extra level of auditing, amid fraud allegations in its welfare-to-work contracts.
The game's narrative flow, as tortuous as we have come to expect, also provides an extra level of immersion.
It's a badge of French's talent that the two books featuring the Mackeys can be read with enjoyment separately or non-chronologically, but regular readers gain an extra level from the backstories, as, crucially, do the fictional figures, who become layered with memories, secrets and sensitivities in the way that real people are.
