In the later course of the game, signs appear that you can collect to be invulnerable for a short time. With this upgrade, you extend the duration that a collected sign lasts.
The specified coins only contain the required number for the next level.
| Bonus Shield | Number of coins |
| 0 | – |
| 1 | 500 |
| 2 | 1100 |
| 3 | 2000 |
| 4 | 3500 |
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