Welcome to Nervos.Land!
To start the demo version of the game you need to have installed MetaMask wallet and get $CKB test tokens.
Easiest way to get $CKB use faucet Godwoken Faucet
Another way is to use bridge.
Please take $CKB L1 address here and use Faucet to claim some tokens, then please use https://testnet.bridge.godwoken.io for deposit $CKB in L2 Testnet. You can use ingame faucet by click on button in left angle «Deposit NLT» for recieve some $NLT