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The 4x4 grid is eight pairs and the 6x6 is eighteen, which is more than double rather than a small step up. It is not simply that the bigger board takes longer - it crosses the point where you can no longer hold the whole layout in your head, and that changes how you play rather than how hard you have to concentrate.

On the small board most people can genuinely remember every card they have turned over, so a good game is close to perfect. On the large one you cannot, so you end up building partial knowledge - a rough sense of which quarter of the board a particular icon lives in - and accepting that some flips are informed guesses. The second of those is the more interesting game.

Worth knowing before you pick: four players on the 4x4 board splits eight pairs between them and is over almost immediately. If you are playing in a group, 6x6 is the one to choose.

Both themes follow identical rules, but they are not equally easy, and which one suits you is personal. Numbers are read left to right and are hard to confuse, which suits anyone who thinks in sequences. Icons are recognised as whole shapes at a glance, which is faster once you are used to them and much better for younger players who are still reading.

There is a practical difference too. Recalling that a six was in the bottom-left is a different mental operation from recalling that the bottom-left had the anchor, and people are usually noticeably better at one than the other. It costs nothing to try a round of each and find out which one you are.

The multiplayer here is entirely local: up to four people take turns on one screen, one device, passing it around or crowding a monitor. There is no online play and no accounts, which is the right call for the kind of game this is.

It changes the game in a way that catches people out. In a solo run, a failed flip costs you a move and nothing else. In a group, every card you turn over is shown to everyone at the table, so a bad guess is a gift to whoever goes next. Good play becomes partly about not revealing anything useful - and once a group works that out, they start playing very differently.

The final screen names the winner rather than just showing scores, which settles arguments quickly.

There is a Resume option, and it works - the board state is kept as you play, so switching to another tab and coming back leaves your game intact. It is worth knowing exactly how far that goes, though, because the game stores it in session storage rather than permanently.

In practice that means one thing: closing the tab or the browser ends the game for good. There is no saved game waiting for you tomorrow and no way to recover a half-finished 6x6 board. If you are partway through a long game with four people, leave the tab open.

The whole game is set in Atkinson Hyperlegible, a typeface the Braille Institute released specifically for readers with low vision. Its characters are drawn to be hard to confuse with one another - the kind of design where a capital I, a lowercase l and a numeral 1 are deliberately made to look nothing alike.

For a game whose numbers theme asks you to tell digits apart from a glance across a grid, that is a more meaningful choice than it first appears, and it is not something most browser games bother with.