An Easy 8×8 Puzzle Solved with Paired Regions in 12 Steps

This 8×8 board rates as easy (difficulty score 659). Solving it from scratch takes 12 logical steps, using 5 techniques: Single cell, Row/column exclusion, Adjacency clear, Region confinement, Paired regions. Every step below is forced: nothing here is a guess.

1. First, every open cell left in this region sits in column A, so its marker has to land there; that clears every other open cell in the column.
2. Next, together, two regions have open cells only in rows 5 and 6; with one marker each, those two markers have to fill exactly those two rows, so every other region's open cells there can be cleared.
3. Then, place a marker at B7. Region has exactly one open cell left. Placing here clears the rest of row 7, column B, and its region. Placing here also clears its 2 touching neighbours.
4. After that, place a marker at A5. Region has exactly one open cell left. Placing here clears the rest of row 5, column A, and its region.
5. Now, place a marker at G6. Region has exactly one open cell left. Placing here clears the rest of row 6, column G, and its region.
6. From there, every open cell left in this region sits in column H, so its marker has to land there; that clears every other open cell in the column.
7. Following that, every open cell left in this region sits in row 8, so its marker has to land there; that clears every other open cell in the row.
8. First, place a marker at H4. Region has exactly one open cell left. Placing here clears the rest of row 4, column H, and its region.
9. Next, place a marker at E3. Region has exactly one open cell left. Placing here clears the rest of row 3, column E, and its region. Placing here also clears its 2 touching neighbours.
10. Then, place a marker at F1. Region has exactly one open cell left. Placing here clears the rest of row 1, column F, and its region.
11. After that, place a marker at C2. Region has exactly one open cell left.
12. Finally, place a marker at D8. Region has exactly one open cell left.

The key move here was Paired regions. Once you can spot that, this board falls quickly. ∎