Object: Fill-in the alternative Sudoku numbers' Elbow grid.

Click upon the visible 9x9 grid, here with a 6x9 adjoining elbow 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 puzzle area - using either of the two Indicator sets.

Each Sudoku puzzle's given squares (in pairs) are mirrored.
The added ELBOW section forms a second '9x9 grid' with the right-side columns: gx, hx, and ix.
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.

(Puzzle generation) Downside note:
Not every initiation process may generate a valid puzzle. More so, with an extra 6x9 grid-wing attached. More advanced computing hardware, and/or a longer Zillions strength setting, should help improve the processed results. Zillions' losing expectations are sometimes premature during the puzzle setups.

A detailed coding explanation note leads the actual zrf file.