10 × 10 is the deepest Patches grid available. Expect 12 to 25 patches (Easy boards have the most, Hard the fewest and largest, up to 28 cells), mostly Freeform clues at Hard, and longer chains of deduction. Each puzzle is verified unique and solvable by pure logic.
If you're new to the larger grids, warm up on the 8 × 8 boards first.