How do you make a minimum block?
If you drag a mod block out and right-click on it and select relabel, you can see a min option at the bottom
... but it's a good exercise to write it yourself, using < and IF.
You forgot to mention that you have to click "relable" after right-clicking the block.
This should be moved to #help:snap-help.
Phew! now I can finish my work!