Merge pull request #14 from SteveDraper/master

Add various difficulties of Sudoku
Add untwistycomplex2 to the base game repository.
Merge pull request #15 from SteveDraper/master

9-board TTT with Pie rule
Add Hex with experimental visualization
Merge pull request #16 from SteveDraper/master

Fix XSLT bug for 9BTTT w/Pie
Delete superfluous HTML file.
Merge pull request #17 from SteveDraper/hex

Add Hex with experimental visualization
Fix typo in Hex visualization

It caused only the top row to display properly.