Our paper wallet generator is very out of date, it's on the to-do list for an update.

Best thing you can do right now is download the client at electrum-game.org, put the binary on a device not connected to the internet, and generate a seed there. Save the seed on a piece of paper or somewhere safe. Print out the addresses it gives you (should give you at least 5) and use those addresses to store your game.

When you choose to spend your GAME, you can simply redownload electrum-game on an online machine, enter your seed, and spend your coins.