Ohmec is nominally about historical maps (Open Historical Map Exploration, roughly). But we love some puzzles. This area contains several playgrounds for (predominantly) Japanese logic puzzles that we have fallen in love with. The available ones are listed below. Each playground environment allows the user to select one of several pre-canned puzzles curated from a list of well crafted specimens. Users can also enter their own from other sources, with instructions on how to translate a puzzle into a descriptor. Each environment has a range of playability modes, from largely non-helpful to graphically assisting the completion, e.g. indicating errors as they are made and highlighting to-be-solved areas. No "solve" buttons are provided, it is not intended to be a "cheat", simply a playground. The playground will indicate when a puzzle is completed by changing the board's border to green.
The list of currently available playgrounds is given here. The ones below the line are written in "old style" and haven't been updated to the new rendering system yet. Please enjoy.