Key
Key is a Common Item in Megabonk. It gives a chance for chests to open without consuming gold.
How to Unlock
Purchase items from 25 chests.
Strategy & Synergies
- Saves gold for shrine activations or mid-run purchases.
- Great in synergy with Golden Glove and Credit Card (Red).
- Luck does not affect Key
- Simple yet impactful economy item across all builds.
How Key's Stack
Formula used in Megabonk for calculating free chest chance:
freeChestChance = totalKeyChance / (totalKeyChance + 1)
For example: Free chest chance with 3 keys:
freeChestChance = 0.3 / (0.3 + 1) * 1 ≈ 0.2307
| Keys | % Chance For Free Chest | % Chance Increase | Expected Chests Per Free |
|---|---|---|---|
| 1 | 9.10% | 11 | |
| 2 | 16.70% | 7.60% | 6 |
| 3 | 23.10% | 6.40% | 4.3 |
| 4 | 28.60% | 5.50% | 3.5 |
| 5 | 33.30% | 4.80% | 3 |
| 6 | 37.50% | 4.20% | 2.7 |
| 7 | 41.20% | 3.70% | 2.4 |
| 8 | 44.40% | 3.30% | 2.2 |
| 9 | 47.40% | 2.90% | 2.1 |
| 10 | 50.00% | 2.60% | 2 |