Gas-Limit – How to Increase Block Gas Limit in Hardhat

The error message

"n: Exceeds block gas limit"

means your transaction has declared a gas value greater that the maximum allowed in the network. A client will reject such transaction.

With ganache-cli you can launch with a larger amount of gas available with the -l parameter:

ganache-cli -l 8000000

Will launch ganache with a block gas limit of 8M.

From the readme documentation it has a mode where you pass extra options in a parameter when you launch ganache. There you can set gasLimit.

const ganache = require("ganache-cli");
const options = { gasLimit: 8000000 };
const server = ganache.server(options);
server.listen(port, (err, blockchain) => {
    /* */
});

This is because the Ropsten miners have dropped the block gas limit down to ~40k over the last few days.

https://ropsten.etherscan.io/blocks

You will need to use a different testnet until the block gas limit rises again.