UKPA Open 2016: Individual Round

The UKPA Open 2016 was held in Croydon on February 27th-28th. Tom Collyer was the winner of the Sudoku competition, with Mark Goodliffe finishing in second and Heather Golding in third. Neil Zussman won the Puzzle competition, with Tom Collyer finishing in second and Steve Barge in third.

I contributed an individual round for the puzzle event and a team round. This post will contain all puzzles from the individual round. The team round will be posted in a separate post.

Puzzles can be found below.

Puzzle #185: Sum Sweeper

This is the thirteenth practise puzzle for this year's UKPA Open.

I originally intended to make puzzles that required you to fill dominoes, triominoes, tetrominoes and pentominoes. But I couldn't actually find or think of any good type for everything. There probably are types that would fit the bill. So instead I just went for a simpler way and use the number 1-2 through 1-5 for the four types.

The problem was there aren't many types that use the numbers 1-2. So I cheated a bit and co-opted the Double Minesweeper genre for this purpose. A little change of name and it makes more sense. This puzzle is pretty hard and stumped some of my test solvers. But there's a really nice logic path to find through this puzzle.

Rules

Place the numbers 1 or 2 in some cells. Clues in grey cells indicate the sum of the digits in the white cells around it.

Example

Puzzle