Off the Quad

Sophomore year isn’t quite the GAS that freshman year was, but you still enjoy The Quad.

It seems different. Not much, but they say you can’t step in the same stream twice, and enough has changed to make the campus slightly less welcoming than it was.

Part of Quad University

Rules:
Normal Sudoku rules apply.
Quadruples: Digits found in circles must appear in one of the four surrounding cells.

Estimated difficulty: 1.5 out of 5