Sudoku generator

A grid with exactly one answer, counted rather than assumed, at three levels — or the solution to one you paste in.

It runs entirely in this browser tab: the seed makes a sheet repeatable, nothing is uploaded, and nothing about a child is stored anywhere.

Settings

Level: More given numbers is a gentler puzzle, which is what a level really is here. Choices: Gentle, Middling, Hard.
How many: How many puzzles on the sheet. A number from 1 to 6.
Solve this one: Paste a grid of your own and this solves it instead.
Print the answers: The key is a column, and switching it off takes the column away.
Seed: The same seed prints the same sheet, for the whole class and for next year. Empty draws a fresh one and shows it.

Can I print the same sheet again?: Yes, and that is what the seed is for. Type a word or a number into it and the sheet is the same every time; share the link and everybody gets that sheet. A fresh one shows the seed it used, so a sheet that went well can be pinned after the fact.
Where are the answers?: On the sheet, unless you switch them off — and the result says which way round it is. Turn them off before handing it out; turn them back on for marking.
Is anything about my class stored?: No. There is no account, no progress and no score, and no list you paste leaves this tab. The sheet is drawn in the browser and printed from it.
How do I print it?: Copy or save the result and print that. What comes out is what is on the screen: the sheets are laid out to be printed rather than to be filled in on a phone.

Word search generator
Your words hidden in a grid, in as many as eight directions, with the answers on a second sheet.

Crossword generator
Your words crossed where their letters agree, numbered, with your clues beside them.

Maze generator
A maze drawn as lines, with exactly one way from the start to the end, and the way marked on a second copy.

Dot-to-dot generator
Five shapes as numbered dots, with the numbers counting by ones or in a times table.