Use nebpay or neb.js instead of asking for a wallet and password.
It's a nice game but I notice you've just forked someone else's work and added a nebulas integration.
https://gabrielecirulli.github.io/2048/
I know you were honest about it on your website but doesn't feel like a lot of effort on your part.
Hello,
So when you convert your nUSDT to USDT, you need to pay the Ethereum gas fee as nUSDT as well as the NAS gas fee.
I'm not sure about the current status of cross-chain swapping via NAS nano Pro so you may need to use the chrome extension wallet instead. Visit Nebulas.io/wallets.html to install and move funds to your extension wallet (with care).
Then try the swap process linking both your nasextwallet and metamask when asked. https://link.nextdao.io/nas-to-eth
Here is the official guide to refer to: https://www.notion.so/nebulas/NextDAO-Cross-chain-Bridge-Decentralized-Swap-Help-Documentation-637a7b9ad2604eeaa43c14713189bfb0
Here's the announcement explaining the different tools: https://medium.com/nebulasio/nebulas-enters-the-cross-chain-defi-space-f30a8828a304
Here is a written guide for the steps with some pics: https://www.notion.so/NextDAO-Cross-chain-Bridge-Decentralized-Swap-Help-Documentation-637a7b9ad2604eeaa43c14713189bfb0
If you've used uniswap or other DeFi tools on Ethereum, this should be easy. If not, feel free to ask any questions.