Play in your browser
DIGIGMA is a website. You type the address, or you follow a link, and a board is there. That sounds too simple to write down, and it is the whole technical idea: the puzzle should not ask you to become a different kind of user before you can place a digit.
Nothing to install
There is no application to download. There is no extra program running beside the browser. DIGIGMA is deliberately not an installable app. We do not want a prompt on the first visit, an icon to manage, or a second copy of the site living in a wrapper. The tab is enough.
Close it when you are done. The next visit is the same address. If that feels like less than a product, it is only because a lot of products have taught us that a puzzle needs a store listing. It does not.
At a desk
A larger screen helps on a harder Killer cage or a crowded Sudoku box, because you can see more of the grid at once. A mouse is precise. A keyboard is fine. Draft marks stay readable. None of that changes the rules. A desk is simply a quieter place to look.
A long sit fits a desk. So does ten minutes before other work. The board does not know which kind of evening you are having.
In a hand
The same grids open on a phone. You tap a cell, then a mark. The cells are meant to be large enough for a thumb. Turn the phone if you want more width; the grid is still the grid. A short Easy Binary Puzzle on 6×6 is a natural phone sit. A Hard Sudoku is still legal. It will ask more of your patience than of your screen size.
If a tap would otherwise force a guess, turn on Draft and mark what still fits. That tool is the same one you have at a desk. There is not a separate “mobile mode” of the puzzle.
Coming back to a board
You do not have to finish in one sitting. Leave a grid, close the tab, come back later. DIGIGMA keeps an unfinished board so you can pick up the same cells. Signed-in play also resumes the same server attempt: the timer, the marks, the mode you were in. You are not starting a new life of the puzzle each time you refresh.
That is not the same as promising that everything you ever touched lives only in this browser. A guest sit is tied to the machine you used. An account is how a name and a history travel with you.
An optional account
You can play without creating one. If you do create one, you choose a username. That name can appear on public boards. Your email does not. The account holds progress: solved grids, streak, best times. It is one person, not a household of profiles.
Use it when you want the next device to recognise you. Skip it when you only wanted ten minutes and a quiet Easy grid. Both are ordinary.
Where to start
Open Games and pick a family. If the board is new, read How to play first, then take Easy. Which game to open first is a longer way of asking the same question. What DIGIGMA is is the product, said in one place.