Shoes code is Ruby code. The name of the binary may be different, and shoes bundles a different standard library, but you can still access any Ruby libraries yo

Shoes code is Ruby code. The name of the binary may be different, and shoes bundles a different standard library, but you can still access any Ruby libraries you like from your Shoes app. That doesn't make it a "level editor for [a] game engine", but it certainly should give you more than enough tools to build a networked tic-tac-toe game.