Object: Fill-in the Sudoku variation numbers grids.
- CircleSquare numbers (1,2,3 - 4,5,6 - and 7,8,9) are restricted to their outline shapes.
It is otherwise known as Trio Sudoku. Number Piece images are slightly modified from Sudoku-doubled; the board image is borrowed from Sudoku-betweens.

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Click upon the visible 9x9 grid to initiate a new puzzle. Once done, the player (Self) needs to click any of the large left-side Indicator numbers to select an active number.
Clicking next onto a grid square(s) will continue to type-in that selected number(s).
A set of secondary indicator numbers are also available - for if/when a player isn't sure when filling in a square. A player may also utilize the empty spaces surrounding the main grid - using either of the two Indicator sets.

Generally, these Sudoku puzzles' given squares (in pairs) are mirrored.
Optionally, individual Numbers can be drawn, either mirrored or by themselves ('potluck') from throughout the grid.
Note: a Hint button is available near the bottom section of the indicator numbers.
Single square hints can be called upon at any player's (Self) turn.
Good luck.

Downside note:
Not every initiation process may generate a valid puzzle. I could only test this via a 15 year-old laptop running Windows 2000 (lol). I expect that result should be easily improved upon with more advanced computing hardware.

A detailed coding explanation note leads the actual zrf file.