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Let's start with a walkthrough!
Go forward and back with the → and ← buttons, or by using your arrow keys.
Click Done or hit Enter to finish the walkthrough.
This is the puzzle. Your goal is to fill every square with the correct number. Every row and column must contain the numbers 1 through 9, no repeats.
This is a cage. Each cage has an arithmetic operation and result written in its upper left corner.
Performing this operation on the numbers in the cage must yield the listed result.
So in this cage, the three squares must add up to 15.
This is the info box, where you can reason about the puzzle, narrowing down which numbers can appear in a square and which combinations of numbers can appear in a cage.
This is the cage info section. On top, we have a list of every possible combination of numbers that could appear in the current cage.
This list is currently filtered to only show combinations that are mathematically possible (i.e. numbers that add up to 15), but this is an option you can turn off.
At the bottom, we have 3 tabs, representing 3 different ways we can narrow down our possible combinations. Let's take a closer look.
Combining all 3 filters, we're down to 2 possible combinations; nice!
One last tip: click the ⟲ button to reset the currently selected filter, or the eraser button to reset all filters.
This is the square info section. Click a number to toggle whether it's a possibility for the current square. Click the eraser button to reset the possibilities.
To narrow possibilities down more quickly, click the ☑ button and then select numbers to rule in as possibilities (thus ruling out every other number). Click ☑ again to confirm.
The faded out numbers are those that can't appear in the square because they don't appear in any possible combination for the current cage.
You can also select multiple squares to batch eliminate possibilities. Cool!
Lastly, the instructions dropdown contains the key info from the walkthrough and more.
Be sure to check out the keyboard shortcuts!
If you'd like to go through this walkthrough again, just refresh the page! (Or turn off the walkthrough in options.)
Good luck!