Help with Nuclear Fission

[Anodos]

My wife and I are new to custom Sudokus, and we are really struggling with this puzzle:

https://logic-masters.de/Raetselportal/R...?id=000B9K

Can anyone provide a hint to get us going?

Thanks

[Anodos]

Don't worry, managed to do it! What a nice puzzle. That said, the one trick to get started did take us a long time.

[uvo]

The best place to discuss a specific portal puzzle is the comments section of that puzzle.