Make at least one 0.15 ETH bridge transaction from Grimsvotn L2 to Eldfell L3.

Here's how to do it:

You must have some tokens (at least ETH) on Grimsvotn L2. You can receive some ETH, HORSE, and BLL from the faucets and then bridge them to Grimsvotn L2 using the Sepolia ↔ Grimsvotn L2 bridge.

After these steps, your tokens will be on Grimsvotn L2 and you can bridge them to Eldfell L3 using the Grimsvotn L2 ↔ Eldfell L3 bridge.