Feature request: Killer Sudoku: apply different colors to sum blocks and add expert mode #160
Description
Is your feature request related to a problem? Please describe.
I used to play Killer Sudoku on an app full of ads, so thanks for this gem, I really appreciate it. However, it would be so much more UI-friendly if the different sum blocks were of different colors, so you can easily differentiate them.
Also, an expert mode with absolutely no numbers at the beginning would be incredible.
Describe the solution you'd like
- Each sum block has a different background color than other touching blocks.
- New difficulty level in Killer mode: no numbers at the beginning of the game
Additional context
Here is a screenshot of what I'm talking about
