Each Key increases your odds, but with diminishing returns — meaning each additional Key adds less benefit than the one before.

The formula is:

% Chance Free = n / (n + 10)

Where n is number of Keys.
This means even with infinite Keys, the chance can never exceed 100%.

• 1 Key → 9.09%
• 5 Keys → 33.33%
• 10 Keys → 50%
• 20 Keys → 66.67%
• 30 Keys → 75%