Rules:
You must solve the puzzle anonymously. That means:
No posting the answer in the comments
No remixing to fill out the answer (You CAN, however, remix it as an unshared project filled out)
The numbers must agree with the hints beside them. (For example, the numbers in the top row concatenates must be a product of two consecutive integers)
I gave you a hint to make it easier.
If you solve it correctly, the nine numbers concatenated per row will make up the project ID of Elementcats Episode
#1, so you can see how much progress I've been into.
One digit per square only.
Update: Fixed an error