Super blocks is a mining boost that multiplies the normal click reward by a random amount from 10x to 100x
Max chance you can naturally get per Dimension:
Overworld: 15%
Nether: 20%
Sweetland: 25%
Buying Super Block boosters will increase everyones chance by +25%, so 50% is the max!
If visiting a friend's island, the owners block reward is not affected by the visitor's super block.