Sudoku has nothing to do with arithmetic. You never add the numbers, never compare them, never put them in order. They are just nine symbols that have to appear once in each row, column and box, and any nine symbols would do the same job. So this game lets you swap them out for pictures.
Pick sprouts and toadstools, pancakes and coffee, moons and comets, or keep the numerals if that is what you grew up with. The puzzle underneath is identical and so is every technique for solving it.
Who this actually helps
Taking the digits out is not decoration. It changes who can play.
- Children who can do the logic before they are fluent with numbers. Matching and elimination come early. Reading a grid of digits at speed comes later. A picture board lets the first happen without waiting for the second.
- People with dyscalculia. A page of numerals can be genuinely tiring to parse even when the reasoning is easy. Shapes and colours cost much less to tell apart.
- Anyone who wants a quieter board. Some people simply find a grid of flowers a nicer thing to look at for twenty minutes than a grid of digits.
Why each set gets its own colours
Colour does a lot of work at tile size. Garden uses leafy greens with a red tulip and a warm acorn. Breakfast leans into yolk, toast, coffee and avocado. Celestial keeps its soft rainbow because it already feels right for the night sky.
Colour is never the only signal. Every tile still has its own silhouette, so the board reads even if two shades look close to you. Changing sets changes the feel, not the puzzle or the way you play it.
The seventeen sets
Getting started with a child
Start on Cozy, which never needs anything harder than spotting the last empty square in a row or box, and pick a set they like the look of. The first thing to teach is not a technique, it is the rule: nine of each, one per row, one per column, one per box. Most children find the last free square by themselves within a few minutes of understanding that.
Turn on Highlight in settings so the row, column and box of the square they are on light up. It makes the rule visible instead of something they have to hold in their head, and it is the single most useful setting for a beginner of any age.