The Real Formula (Not +10% Per Key)
The game lies to you. Keys actually use a hyperbolic formula:
n / (n + 10)
This creates massive diminishing returns, but still gives insane value early on.
Chance: 50.00%
Formula: n / (n + 10)
MegaBonk Key Mechanics Explained (The REAL Formula)
Keys are way stronger, and way weirder than the description suggests. Here’s the true math behind free chests, how many Keys you actually need, and why Keys can scale your run incredibly hard.
Why Keys Are Still OP
- Free chests = more items, period.
- Free chests prevent cost increases.
- Early Keys snowball your entire run.
- Synergy — Credit Cards: Scale Luck and Damage massively when done right. This is how to get WR runs.
Full Chance Table
| Keys | Chance |
|---|---|
| 1 | 9.09% |
| 2 | 16.67% |
| 3 | 23.08% |
| 4 | 28.57% |
| 5 | 33.33% |
| 6 | 37.50% |
| 7 | 41.18% |
| 8 | 44.44% |
| 9 | 47.37% |
| 10 | 50.00% |
| 11 | 52.38% |
| 12 | 54.55% |
| 13 | 56.52% |
| 14 | 58.33% |
| 15 | 60.00% |
| Keys | Chance |
|---|---|
| 16 | 61.54% |
| 17 | 62.96% |
| 18 | 64.29% |
| 19 | 65.52% |
| 20 | 66.67% |
| 21 | 67.74% |
| 22 | 68.75% |
| 23 | 69.70% |
| 24 | 70.59% |
| 25 | 71.43% |
| 26 | 72.22% |
| 27 | 72.97% |
| 28 | 73.68% |
| 29 | 74.36% |
| 30 | 75.00% |
TL;DR Summary
- Keys DO NOT give +10% each — they use n / (n + 10).
- 10 Keys = 50% free chest chance.
- Free chests = more items = more scaling.
- Pair Keys with Credit Card and Luck for max value.
- One of the best early-game items for snowballing.
More MegaBonk tools and guides
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