This relatively new grid puzzle genre is invented by [Anonymus25](https://puzzling.stackexchange.com/q/115300/28719).

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**Rules of Circles and Squares**:

1. Shade some cells so that all shaded cells form one orthogonally connected area and each orthogonally connected area of unshaded cells is in the shape of a square.
2. Cells with black circles must be shaded, and cells with white circles must not be shaded.
3. No 2x2 region may be entirely shaded.

[![enter image description here](https://i.stack.imgur.com/IqCvml.png)](https://i.stack.imgur.com/IqCvml.png)