# Sudoku - Puzzle 1

Here's the first puzzle. It's rated as easy, so if you're still finding your way with these puzzles then this should be a fairly
gentle introduction.

This puzzle either runs inside the web page, as it should be doing now, or you can use the "Float Window" button to popup a new
window which you can make bigger or smaller as you want. To fill in a number that you definitely know, use your mouse to left-click
on the square and select the number. If you're not sure but want to mark a possibility (for example, the 2 can either be here or here),
right-click on the square and select the number. This possibility will be written smaller and grey in the corner of the square, like
a pencil mark to remind you. See about the helper for more information on what all the buttons, markers
and rollovers mean.

### Good luck!

The applet running here is from the ActivityWorkshop, and the numbers were generated using the free (GPL'd) software
Sudoku Sensei.
This example is coded as `N1-045`

which means only level 1 rules are needed to solve it, and it starts with 45
empty squares. Later puzzles will get harder, to give you a challenge once you've solved this one!