## Archive for the ‘**Misc. Shading**’ Category

## Puzzle 25: Oasis

Rules (from the WPC 2016 instruction booklet): “Shade some cells in the grid. Shaded cells cannot touch each other orthogonally. All unshaded cells must be orthogonally interconnected. Unshaded cells cannot form a 2×2 square. Cells with circles cannot be shaded. A number indicates how many other numbers or circles can be reached from that cell by passing only orthogonally through empty unshaded cells (it cannot pass a shaded cell nor a cell with a number / circle).”

Notes: I think Oasis is the best new puzzle type introduced at the 2016 WPC. It feels very original, the rules are intuitive and relatively simple, and there’s tons of potential for interesting local and global logic (as demonstrated in the GP round 2 Oasis puzzles, which I highly recommend). I’d love to see others construct this type; let me know if there are other examples out there (the only other one I know of is on Walker’s blog).

Also, this was indeed the 25th WPC.