Oops! - Undo

Have you ever been building a giant wall out of obsidian and made an accidental placement only to have to cry in a corner in shame because you're inadequate? I know I have, 'Oops' was made to solve this problem, when 'Oops' is present you have 3 seconds to break the block you placed and get it right back, no need for a tool or anything! Take a look at these gifs to get an idea.

Without Oops

With Oops

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