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Thursday, April 13, 2017

Plus Fifteen by Robert Currie FREE

iPhone Screenshot 1  iPhone Screenshot 2
Plus Fifteen comes from Robert Currie.  The object is to link up numbers that add up to 15.
iPhone Screenshot 3  iPhone Screenshot 5
Each level has exactly 1 solution. Grid sizes go from 6x6 to 9x9.

I like the graphics a lot.  For some reason, you can't redo a level that's already been solved.  Hmmm.

The fact that there is only 1 solution for each level leads to some interesting analysis.  Look at the first image. The top row has 11 & 4 directly in the center. Under it is 4 & 11.  If the top 11 pairs with the 4 below it or to its right, then the other 11 must pair with the 4 that's left or above it.  But because there's only 1 solution, we know that those pairings would lead to two possible solutions.  Therefore, that top 11 must pair with the 4 on its left.

1 comment:

  1. Thanks for taking the time to review our game and really happy that you find it as interesting as we do.

    You actually CAN redo puzzles but only AFTER you complete that level. I'll definitely add something to the next version to make that more clear.